Mid Term Exam Semester 1.pdf

8/14/2019 Mid Term Exam Semester 1.pdf

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Mid Term Exam Semester 1

1. Oracle Database Software provides which of the following functionality? (Choose two) Mark

for Review(1) Points

(Choose all correct answers)

Graphical User Interface (*)

Internet Browser

Server (*)

Operating System

2. The first step in system development is to document the requirements. Why? Mark for Review(1) Points

Wrong. A blueprint for the database design is not needed. We can just start coding straight away.

It clarifies what a business wants to accomplish, and provides measures for deciding if the systemdelivers all that is required. (*)

It allows application development to be conducted without having to consider database design.

It keeps businesses honest.

3. The main subject areas taught by the Oracle Academy are: Mark for Review

(1) Points

Computer Repairs

Database performance tuning.

Data Modeling, SQL and PL/SQL (*)

Systems programming and computer architecture


2/150

4. Consider your school library. It will have a database with transaction details of which student

borrows which books. Is details of the total number of books out on loan in one given month Data

or Information? Mark for Review(1) Points

Data

Information (*)

Both

Neither

5. Data modelling is performed for the following reasons: (Choose Two) Mark for Review(1) Points


The ERDs becomes a blueprint for designing the actual system. (*)

It helps discussions and reviews. (*)

We do not need datamodels, we can just start coding right away.

We just draw the ERDs to please the users, once they are finished we never look at them again. Theyserve no purpose in the real world.

6. Entity and Attribute names are always interchangable, so you need not worry about choosingthe right type. True or False? Mark for Review(1) Points

True

False (*)

7. All of the following would be instances of the entity ANIMAL SPECIES except which? Mark


Dog

Bird

Elephant

Leaf (*)

8. The entity/relationship model is created before the physical database design model? True or

False? Mark for Review(1) Points


3/150

True (*)

False

9. In a physical data model, a relationship is represented as a? Mark for Review (1) Points

Column

Row

Instance

Foreign Key (*)

10. Volatile entities have special requirements and need special attention when you are doingdata modelling. True or False? Mark for Review(1) Points

True (*)

False

11. A/an _________ is a picture of all the information that will form the basis for the finished

system. Mark for Review(1) Points

ERD (*)

Process

Table

Attribute

12. When reading an ERD including Relationships you are said to be speaking: Mark for Review(1) Points

Relationship-ish

Gibberish

ERDish (*)

Entity-ish

13. All the Attributes in a system are just written on the ERD, and they all go in the Top Left

Hand Corner of the paper. True or False? Mark for Review(1) Points

True


4/150

False (*)

14. A Matrix Diagram should be developed by your users. True or False? Mark for Review(1) Points

True

False (*)

15. Relationship Degree/Cardinality is important. True or False? Mark for Review (1) Points

True (*)

False

16. Relationship Names are optional. True or False? Mark for Review(1) Points

True

False (*)

17. A new system would have a mixture of both Procedural and Structural Business Rules as part

of the documentation of that new system. True or False? Mark for Review

(1) Points

True (*)

False

18. The Other subtype is mandatory. True or False? Mark for Review(1) Points

True

False (*)

19. A supertype can only have two subtypes and no more. True or False? Mark for Review(1) Points

True

False (*)

20. You can only create relationships to a Supertype, not to a Subtype. True or False? Mark for

Review(1) Points


5/150

True

False (*)

21. A Supertype can have only one subtype. True or False? Mark for Review(1) Points

True

False (*)

22. When creating entities you must follow these rules: (Choose Two) Mark for Review(1) Points


Name them in Plural

Name them in Singular (*)

Exclude Attributes

Include Attributes (*)

23. If a relationship can NOT be moved between instances of the entities it connects, it is said to

be: Mark for Review(1) Points

Mandatory

Optional

Transferrable

Non-Transferrable (*)

24. Which of the following pairs of entities is most likely to be modeled as a M:M relationship?

Mark for Review(1) Points

CAR and WHEEL

TREE and BRANCH

PERSON and FINGERPRINT

TEACHER and SUBJECT AREA (*)

25. If two entities have two relationships between them, these relationships can be either


6/150

_____________ or _____________ ? Mark for Review(1) Points

Redundant or Required (*)

Replicated or Required

Resourced and Really Good

Redundant and Replicated

26. What uncommon relationship is described by the statements: Each DNA SAMPLE may be

taken from one and only one PERSON and each PERSON may provide one and only one DNA

SAMPLE Mark for Review(1) Points

One to Many Optional

One to Many Mandatory

One to One Optional (*)

Many to Many Mandatory

27. How do you include a relationship as part of the UID for an entity? Mark for Review (1) Points

By barring the relationship in question (*)

By reporting it in an external document

By including the UID from the parent entity as an attribute in the entity

You cannot model that.

28. When you resolve a M-M you simply re-draw the relationships between the two original

entities, no new entities are created. True or False? Mark for Review (1) Points

True

False (*)

29. Intersection Entities often have the relationships participating in the UID, so the relationships

are often barred. True or False? Mark for Review(1) Points

True (*)

False


7/150

30. What do you call the entity created when you resolve a M:M relationship? Mark for Review(1) Points

Intersection entity (*)

Inclusion entity

Recursive entity

M:M entity

31. When is an entity in 2nd Normal Form? Mark for Review (1) Points

When all non-UID attributes are dependent upon the entire UID. (*)

When no attritibutes are mutually independant and fully independent on the primary key.

When no attritibutes are mutually independent and all are fully dependent on the primary key.

None of the Above.

32. All entities must be given a new artificial UID. True or False? Mark for Review(1) Points

True

False (*)

33. There is no limit to how may UIDs an entity can have. True or False? Mark for Review (1) Points

True (*)

False

34. Normalizing an Entity to 1st Normal Form is done by removing repeated or redundant

attributes. True or False? Mark for Review(1) Points

True (*)

False

35. No commercial database systems in the world will accept tables that are not on 3rd Normal

Form. True or False? Mark for Review(1) Points

True

False (*)


8/150

36. If Audit trail attributes are added to an entity they must be in the entities they are auditing.

True or False? Mark for Review(1) Points

True (*)

False

37. Which of the following would be good as a Unique Identifier for its Entity? (Choose Three)



Personal Identification number for Person (*)

Vehicle Registration Number for Car (*)

ISBN Number for Book (*)

Date of birth for Baby

38. No parts of an UID are mandatory. True or False? Mark for Review(1) Points

True

False (*)

39. Primary UIDs are: Mark for Review(1) Points

Something that each Entity should have, but is not mandatory (*)

Useful as an alternative means of identifying instances of an entity, independent of their datatype

Mandatory in data modeling

Always comprised of numbers

40. Arcs are Mandatory in Data modeling. All ERDs must have at least one Arc. True or False?


True

False (*)

31. When is an entity in 2nd Normal Form? Mark for Review


9/150

(1) Points




None of the Above.

32. All entities must be given a new artificial UID. True or False? Mark for Review(1) Points

True

False (*)

33. There is no limit to how may UIDs an entity can have. True or False? Mark for Review

(1) Points

True (*)

False

34. Normalizing an Entity to 1st Normal Form is done by removing repeated or redundant

attributes. True or False? Mark for Review

(1) Points

True (*)

False

35. No commercial database systems in the world will accept tables that are not on 3rd Normal

Form. True or False? Mark for Review(1) Points

True

False (*)

36. If Audit trail attributes are added to an entity they must be in the entities they are auditing.


True (*)

False


10/150

37. Which of the following would be good as a Unique Identifier for its Entity? (Choose Three)








True

False (*)








True

False (*)

41. All relationships participating in an arc must be mandatory. True or False? Mark for Review(1) Points

True

False (*)

42. An arc can also be modeled as Supertype and Subtypes. True or False? Mark for Review(1) Points


11/150

True (*)

False

43. Modeling historical data is Optional. True or False? Mark for Review(1) Points

True (*)

False

44. When you add the concept of time to your data model, your model becomes more complex.


True (*)

False

45. Which of the following is a logical constraint that could result from considering how time

impacts an example of data storage? Mark for Review(1) Points

An ASSIGNMENT may only refer to an EMPLOYEE with a valid employee record at the Start Dateof the ASSIGNMENT. (*)

EMPLOYEE periods can overlap causing the database to crash.

End Date must be before the Start Date.

Dates must be stored with Time.

46. All systems must include functionality to provide logging or journaling in conceptual data

models. True or False? Mark for Review(1) Points

True

False (*)

47. All datamodels must be transformed from specific to generic. True or False? Mark for

Review(1) Points

True

False (*)


12/150

48. A datamodel containing generic modeling techniques must not be mixed in with non-generic

models. The generic entities MUST be drawn on a diagram of their own. True or False? Mark


True

False (*)

49. There is no point in trying to group your entities together on your diagram according to

volume. Making a diagram pretty is a waste of time. True or False? Mark for Review (1) Points

True

False (*)

50. Which of the following statements are true for ERDs to enhance their readability. (Choose

Two) Mark for Review(1) Points


Is is OK to break a big ERD down into subsets of the overall picture. This way you end up with morethan one ERD, that together documents the entire system. (*)

Try to avoid crossing lines (*)

The crows feet (many ends) can point whichever way is the easiest to draw

You must ensure you have all the entities on one single, big diagram, even if you have hundreds

1. Entities are transformed into Tables during the Database Design process. True or False? Mark


True (*)

False





Internet Browser

Server (*)

Operating System


13/150

3. Consider your school library. It will have a database with transaction details of which student

borrows which books. Is details of the total number of books out on loan in one given month Data

or Information? Mark for Review(1) Points

Data

Information (*)

Both

Neither

4. The main subject areas taught by the Oracle Academy are: Mark for Review(1) Points

Computer Repairs




5. Data modelling is performed for the following reasons: (Choose Two) Mark for Review(1) Points


The ERDs becomes a blueprint for designing the actual system. (*)

It helps discussions and reviews. (*)

We do not need datamodels, we can just start coding right away.

We just draw the ERDs to please the users, once they are finished we never look at them again. Theyserve no purpose in the real world.

6. Entity Relationship modeling is dependent on the hardware or software used for

implementation, so you will need to change your ERD if you decide to change Hardware Vendor.


True

False (*)

7. All of the following could be attributes of an ENTITY called PERSON except one. Select the

incorrect one: Mark for Review(1) Points

Haircolor


14/150

Weight

Gender

Natacha Hansen (*)

Correct

8. Which of the following statements about relationships are true? (Choose Two) Mark for

Review(1) Points


They become foreign keys in the database. (*)

They must be mandatory to be created in the database.

They can be either mandatory or optional. (*)

They must exist between two different Entities.

9. Volatile entities have special requirements and need special attention when you are doing data

modelling. True or False? Mark for Review(1) Points

True (*)

False

10. All of the following would be instances of the entity ANIMAL SPECIES except which? Mark


Dog

Bird

Elephant

Leaf (*)

11. An entity is instantiated as a ? Mark for Review (1) Points

Experience

Instance

Table (*)

None of the above


15/150

12. Relationship Degree/Cardinality is important. True or False? Mark for Review (1) Points

True (*)

False

13. Which of the following are valid relationship degrees? (Choose two) Mark for Review(1) Points


1:1 (*)

1:M (*)

1:O

O:O

14. Matrix Diagrams are mandatory when doing data modelling. True or False? Mark for

Review(1) Points

True

False (*)

15. A Matrix Diagram should be developed by your users. True or False? Mark for Review(1) Points

True

False (*)

16. Entity names are always singular. True or False? Mark for Review(1) Points

True (*)

False

17. A new system would have a mixture of both Procedural and Structural Business Rules as part

of the documentation of that new system. True or False? Mark for Review(1) Points

True (*)

False


16/150



Name them in Plural


Exclude Attributes


19. You can only create relationships to a Supertype, not to a Subtype. True or False? Mark for

Review(1) Points

True

False (*)

20. All ER diagrams must have one of each of the following: (Choose two) Mark for Review (1) Points


One or more Entities (*)

Relationships between entities (*)

Arcs

At least one supertype and subtype


True

False (*)


True

False (*)

23. Intersection Entities are at the Master end in the relationships between it and the original


17/150

entities. So the original entities are details or children of the newly created intersection entity.


True

False (*)

24. When you resolve a M-M you simply re-draw the relationships between the two original

entities, no new entities are created. True or False? Mark for Review (1) Points

True

False (*)

25. Intersection Entities often have the relationships participating in the UID, so the relationships

are often barred. True or False? Mark for Review

(1) Points

True (*)

False

26. If a relationship can NOT be moved between instances of the entities it connects, it is said to

be: Mark for Review

(1) Points

Mandatory

Optional

Transferrable

Non-Transferrable (*)

27. What uncommon relationship is described by the statements: Each DNA SAMPLE may be

taken from one and only one PERSON and each PERSON may provide one and only one DNA

SAMPLE Mark for Review(1) Points





28. How do you include a relationship as part of the UID for an entity? Mark for Review


18/150

(1) Points





29. Many to many relationships must be left in the Model. It is important to have them

documented as M-M. True or False? Mark for Review(1) Points

True

False (*)

30. Which of the following pairs of entities is most likely to be modeled as a M:M relationship?


CAR and WHEEL

TREE and BRANCH



31. The first UID for an entity is called the Primary UID, the second is called Secondary UID and

so on. Mark for Review(1) Points

Yes, this is the way UIDs are named. (*)

No, it is not possible to have more than one UID for an Entity.

Yes, but then it stops. No entities can have more than two UIDs.

No, each Entity can only have one UID, the secondary one.

32. There is no limit to how may UIDs an entity can have. True or False? Mark for Review (1) Points

True (*)

False

33. As a database designer you do not need to worry about where in the datamodel you store a

particular attribute, as long as you get it onto the ERD your job is done. True or False? Mark for

Review


19/150

(1) Points

True

False (*)

34. Would it be a good idea to model age as an attribute of STUDENT? Mark for Review (1) Points

Yes

Maybe it could stop us having to calculate someones age every time we need it

Sometimes

No it breaks the Normalization rules (*)

35. Until all attributes are single-valued, the database model is said to be: Mark for Review

(1) Points

Normalized

Not Normalized (*)

1st Normal Form

2nd Normal Form

Incorrect. Refer to Section 6 Lesson 2.






37. Which of the following is NOT a relationship type? Mark for Review (1) Points

Some to None (*)

One to One

One to Many

Many to Many


20/150


True

False (*)

39. Which of the following would best be represented by an arc? Mark for Review(1) Points

TEACHER (Female, Bob)

DELIVERY ADDRESS (Home, Office) (*)

PARENT (Girl, Bob)

STUDENT (Grade A student, Average Student)



True

False (*)

41. Historical data must never be kept. True or False? Mark for Review(1) Points

True

False (*)

42. A recursive relationship must Mandatory at both ends. True or False? Mark for Review(1) Points

True

False (*)

43. If a system includes the concept of time and it stores Start Dates, then End Dates becomes

Mandatory. For each Start Date attribute you create, you MUST create an End Date attribute

and it must be mandatory. True or False? Mark for Review(1) Points

True

False (*)


21/150

44. All systems must have an entity called WEEK with a holiday attribute, so you know when to

give your employees a holiday. True or False? Mark for Review(1) Points

True

False (*)

45. All systems must include functionality to provide logging or journaling in conceptual data

models. True or False? Mark for Review(1) Points

True

False (*)

46. Which of the following is a logical constraint that could result from considering how time

impacts an example of data storage? Mark for Review(1) Points





47. All datamodels must be transformed from specific to generic. True or False? Mark for

Review(1) Points

True

False (*)

48. Generic models are generally far more complex than a specific model. True or False? Mark


True

False (*)

49. There are formal rules for how to draw ERDs, even though they are only guidelines, you

should always try to follow them. True or False? Mark for Review(1) Points


22/150

True (*)

False

50. There is no point in trying to group your entities together on your diagram according tovolume. Making a diagram pretty is a waste of time. True or False? Mark for Review (1) Points

True

False (*)





Internet Browser

Server (*)

Operating System

2. The market for IT professionals is still increasing and will continue to do so in the future, asthe world gets ever more dependent on computer systems. True or False? Mark for Review (1) Points

True (*)

False

3. Information which was gained from data is the same as: (Choose Two) Mark for Review(1) Points


Knowledge (*)

Raw Materials

Intelligence (*)

There is no difference between data and information.

4. Entities are transformed into Tables during the Database Design process. True or False? Mark



23/150

True (*)

False

5. Entity and Attribute names are always interchangable, so you need not worry about choosing

the right type. True or False? Mark for Review(1) Points

True

False (*)

6. An entity can have many Unique Identifiers. True or False? Mark for Review(1) Points

True (*)

False

7. All of the following could be attributes of an ENTITY called PERSON except one. Select theincorrect one: Mark for Review(1) Points

Haircolor

Weight

Gender

Natacha Hansen (*)

8. Which of the following statements about relationships are true? (Choose Two) Mark for Review(1) Points


They become foreign keys in the database. (*)

They must be mandatory to be created in the database.



9. A/an _________ is a picture of all the information that will form the basis for the finished system.Mark for Review

(1) Points

ERD (*)


24/150

Process

Table

Attribute

10. An entity is instantiated as a ? Mark for Review(1) Points

Experience

Instance

Table (*)

None of the above

Section 2

11. Documenting Business Requirements helps developers control the scope of the systems, so users donot suddenly want the new system to contain twice as much functionality. True or False? Mark forReview(1) Points

True (*)

False

12. When reading a relationship between 2 entities, the relationship is read both from left to right andright to left. True or False? Mark for Review(1) Points

True (*)

False

13. Relationship Names are optional. True or False? Mark for Review(1) Points

True

False (*)

14. Relationships represents something of significance to the business. True or False? Mark for Review(1) Points

True (*)

False


25/150

15. All the Attributes in a system are just written on the ERD, and they all go in the Top Left HandCorner of the paper. True or False? Mark for Review(1) Points

True

False (*)

16. A Matrix Diagram should be developed by your users. True or False? Mark for Review

(1) Points

True

False (*)


True

False (*)

18. You can only create relationships to a Supertype, not to a Subtype. True or False? Mark for Review(1) Points

True

False (*)



Name them in Plural


Exclude Attributes


20. Which of the following is true about subtypes? Mark for Review(1) Points

One instance may belong to two subtypes of the same supertype.

Subtypes must be mutually exclusive. (*)

Subtypes must not be mutually exclusive.


26/150

Subtype entities may not have relationships to the other subtype entities, only the supertype itself.

21. A supertype can only have two subtypes and no more. True or False? Mark for Review

(1) Points

True

False (*)

22. Business rules are important to data modelers. True or False? Mark for Review(1) Points

True (*)

False

23. Transferable relationships can only be mandatory, not optional. True or False? Mark for Review(1) Points

True

False (*)

24. A relationship from an entity back to itself is called a ___________ relationship. Mark for Review

(1) Points

Mandatory

Recursive (*)

Many to Many Optional

Transferrable

25. Many to many relationships must be left in the Model. It is important to have them documented asM-M. True or False? Mark for Review(1) Points

True

False (*)

26. Relationships can be Redundant. True or False? Mark for Review(1) Points

True (*)

False


27/150

27. How do you include a relationship as part of the UID for an entity? Mark for Review(1) Points





28. Intersection Entities often have the relationships participating in the UID, so the relationships areoften barred. True or False? Mark for Review(1) Points

True (*)

False

29. When you resolve a M-M you simply re-draw the relationships between the two original entities,no new entities are created. True or False? Mark for Review(1) Points

True

False (*)

30. What do you call the entity created when you resolve a M:M relationship? Mark for Review(1) Points

Intersection entity (*)

Inclusion entity

Recursive entity

M:M entity

31. Normalizing an Entity to 1st Normal Form is done by removing repeated or redundant attributes.True or False? Mark for Review(1) Points

True (*)

False

32. No commercial database systems in the world will accept tables that are not on 3rd Normal Form.True or False? Mark for Review


28/150

(1) Points

True

False (*)

33. Would it be a good idea to model age as an attribute of STUDENT? Mark for Review(1) Points

Yes


Sometimes


34. All entities must be given a new artificial UID. True or False? Mark for Review

(1) Points

True

False (*)

35. There is no limit to how may UIDs an entity can have. True or False? Mark for Review

(1) Points

True (*)

False

Section 7

36. A relationship can be both Recursive and Hierachal at the same time. True or False? Mark forReview(1) Points

True

False (*)

37. Modeling historical data can produce a unique identifier that always excludes dates. True or False?Mark for Review(1) Points

True

False (*)


29/150

38. Arcs are Mandatory in Data modeling. All ERDs must have at least one Arc. True or False? Markfor Review(1) Points

True

False (*)







True

False (*)

41. Arcs are used to visually represent _________ between two or more relationships in an ERD. Markfor Review(1) Points

Sameness

Differences

Exclusivity (*)

Inheritance

42. Which of the following would best be represented by an arc? Mark for Review

(1) Points


DELIVERY ADDRESS (Home, Office) (*)

PARENT (Girl, Bob)


43. You are doing a data model for a computer sales company, where the price of postage is dependent


30/150

on what day of the week goods are shipped. So shipping is more expensive if the customer wants adelivery to take place on a Saturday or Sunday. What would be the best way to model this? Mark forReview(1) Points

Use a Delivery Day entity, which holds prices against week days, and ensure the we also have an

attribute for the Requested Delivery Day in the Order Entity. (*)

Email current price to all employees whenever the prices change.

Update the prices in the system, print out the current prices when they change and pin them on thecompany noticeboard

Allow them to enter whatever ever delivery charge they want.

44. All systems must include functionality to provide logging or journaling in conceptual data models.True or False? Mark for Review

(1) Points

True

False (*)


True (*)

False

46. If a system includes the concept of time and it stores Start Dates, then End Dates becomesMandatory. For each Start Date attribute you create, you MUST create an End Date attribute and itmust be mandatory. True or False? Mark for Review

(1) Points

True

False (*)

47. There are formal rules for how to draw ERDs, even though they are only guidelines, you shouldalways try to follow them. True or False? Mark for Review

(1) Points

True (*)

False

48. Which of the following statements are true for ERDs to enhance their readability. (Choose Two)



31/150


Is is OK to break a big ERD down into subsets of the overall picture. This way you end up with morethan one ERD, that together documents the entire system. (*)

Try to avoid crossing lines (*)

The crows feet (many ends) can point whichever way is the easiest to draw

You must ensure you have all the entities on one single, big diagram, even if you have hundreds

49. A datamodel containing generic modeling techniques must not be mixed in with non-genericmodels. The generic entities MUST be drawn on a diagram of their own. True or False? Mark forReview(1) Points

True

False (*)

50. All datamodels must be transformed from specific to generic. True or False? Mark for Review(1) Points

True

False (*)

1. The market for IT professionals is still increasing and will continue to do so in the future, as theworld gets ever more dependent on computer systems. True or False? Mark for Review(1) Points

True (*)

False

2. Consider your school library. It will have a database with transaction details of which studentborrows which books. Is a record of one student borrowing one book Data or Information? Mark forReview(1) Points

Data (*)

Information

Both

Neither

3. Information which was gained from data is the same as: (Choose Two)

Mark for Review(1) Points(Choose all correct answers)


32/150

Knowledge (*)Raw MaterialsIntelligence (*)There is no difference between data and information.

4. Databases are used in most countries and by most governments. Life, as we know it, would changedrastically if we no longer had access to databases. True or False? Mark for Review(1) Points

True (*)

False

5. Oracle Database Software provides which of the following functionality? (Choose two) Mark forReview(1) Points



Internet Browser

Server (*)

Operating Systems

6. Which of the following are types of databases? Mark for Review

(1) Points


Hierarchical (*)

Relational (*)

SQL

Network (*)

7. In a physical data model, a relationship is represented as a? Mark for Review(1) Points

Column

Row

Instance

Foreign Key (*)

8. All of the following are examples of ENTITY: Instance except two. Select the answers that areENTITY: Instance. (Choose Two) Mark for Review

(1) Points



33/150

TRANSPORTATION METHOD: Car (*)

ANIMAL: Dog (*)

MEAT PRODUCT: Lettuce

BODY PART: Larry Ellison

9. Relationship names are usually verbs. True or False? Mark for Review(1) Points

True (*)

False

10. All of the following would be instances of the entity ANIMAL SPECIES except which? Mark forReview(1) Points

Dog

Bird

Elephant

Leaf (*)

11. Primary Unique Identifiers (Choose Two) Mark for Review(1) Points


Are Required. The data model is not complete until all entities have a Primary UID. (*)

Distinguish each instance of an entity from all others (*)

Are not required

You may create more than one Primary Unique Identifier for an entity

12. The entity/relationship model is created before the physical database design model. True or False?Mark for Review(1) Points

True (*)

False

13. An entity can have many Unique Identifiers. True or False? Mark for Review(1) Points

True (*)

False

14. Relationship Names are optional. True or False?Mark for Review(1) Points


34/150

TrueFalse (*)

15. Which of the following are valid relationship degrees? (Choose two) Mark for Review(1) Points


1:1 (*)

1:M (*)

1:O

O:O

16. Entity Boxes are drawn with 90 degree angles, also known as Hard Boxes. True or False? Mark for

Review(1) Points

True

False (*)

17. To identify an attribute as part of a unique identifier on an ER diagram, the # symbol goes in frontof it. True or False? Mark for Review(1) Points

True (*)

False

18. When reading an ERD including Relationships you are said to be speaking: Mark for Review(1) Points

Relationship-ish

Gibberish

ERDish (*)

Entity-ish



Name them in Plural


Exclude Attributes



35/150

20. All instances of a subtypes may be an instance of the supertype but does not have to. True or False?Mark for Review(1) Points

True

False (*)

21. You can only create relationships to a Supertype, not to a Subtype. True or False? Mark for Review(1) Points

True

False (*)


True

False (*)

23. Which of the following are suitable Entity names? (Choose Two) Mark for Review(1) Points


DOGS

ANIMAL (*)

ANIMALS

DOG (*)

24. Only teachers may supervise exams is an example of which of the following? Mark for Review

(1) Points

A procedural business rule (*)

An attribute that should be stored on the PERSON entity

A structural business rule

An attribute that is not be inherited from the PERSON supertype and is unique to the TEACHER

subtype

25. A business rule such as We only ship goods after customers have completely paid any outstandingbalances on their account is best enforced by: Mark for Review(1) Points

Making the payment attribute null.

Making the payment attribute optional.

We need to trust our customers, and we know they will pay some day.


36/150

Hiring a programmer to create additional programming code to verify no goods are shipped until theaccount has been settled in full. (*)

26. A new system would have a mixture of both Procedural and Structural Business Rules as part of thedocumentation of that new system. True or False? Mark for Review

(1) Points

True (*)

False

27. Why is it important to identify and document structural rules? Mark for Review(1) Points

Ensures we know what data to store and how that data works together. (*)

Ensures nothing. There is no benefits to be gained from documenting your Structural Business Rules.We need to concentrate on the Procedural Business Rules only.

Ensures we know what Information to store and how that Information works together.

All of the Above.

28. A Diamond on a relationship indicates the Relationship as Non-Tranferrable. True or False? Markfor Review(1) Points

True (*)

False

29. How do you include a relationship as part of the UID for an entity? Mark for Review(1) Points





30. Relationships can be Redundant. True or False? Mark for Review(1) Points

True (*)

False

31. Which of the following pairs of entities is most likely to be modeled as a M:M relationship? Markfor Review(1) Points

CAR and WHEEL

TREE and BRANCH


37/150



32. Many to many relationships must be left in the Model. It is important to have them documented as

M-M. True or False? Mark for Review(1) Points

True

False (*)

33. All entities must be given a new artificial UID. True or False?Mark for Review(1) PointsTrue

False (*)

34. An entity without repeated values is said to be on 1st Normal Form. True or False? Mark for

Review(1) Points

True (*)

False

35. When is an entity in 2nd Normal Form? Mark for Review

(1) Points




None of the Above.

36. Consider the entity ADDRESS with the attributes:ADDRESS:# House Number* Street

* Town* City* Year of Buildo City Population

This entity is NOT in 3rd Normal Form (no non-UID attribute can be dependent on another non-UIDattribute). True or False?Mark for Review(1) Points

True (*)


38/150

False

37. An arc can be modelled as Supertype and Subtypes. True or False? Mark for Review(1) Points

True (*)

False

38. No parts of a UID are mandatory. True or False? Mark for Review(1) Points

True

False (*)

39. Which of the following is NOT a relationship type? Mark for Review(1) Points

Some to None (*)

One to One

One to Many

Many to Many


True

False (*)

41. Which of the following would be good as a Unique Identifier for its Entity? (Choose Three) Markfor Review(1) Points






Section 7 Lesson 3(Answer all questions in this section)

42. Historical data must never be kept. True or False? Mark for Review(1) Points

True

False (*)


39/150


43. Database Design projects must use Consultants or they will fail. True or False? Mark for Review(1) Points

True

False (*)


44. Which of the following are NOT valid techniques for effective public speaking? (Choose Two)Mark for Review(1) Points


Whispering (*)

Using specialist language and technical abbreviations when communicating technical information (*)

Being enthusiastic

All of the Above


45. All systems must have an entity called WEEK with a holiday attribute, so you know when to give

your employees a holiday. True or False? Mark for Review

(1) Points

True

False (*)

46. Modeling historical data is Optional. True or False? Mark for Review

(1) Points

True (*)

False

47. If a system includes the concept of time, and it stores Start Dates, then End Dates becomesMandatory. For each Start Date attribute you create, you MUST create an End Date attribute and itmust be mandatory. True or False? Mark for Review

(1) Points

True

False (*)

48. When you add the concept of time to your data model, your model becomes more complex. True orFalse? Mark for Review(1) Points

True (*)


40/150

False


49. Which of the following is a logical constraint, that could result from considering how time impacts

data storage? Mark for Review(1) Points





50. You are doing a data model for a computer sales company, where the price of postage is dependant

on what day of the week goods are shipped. So shipping is more expensive if the customer wants adelivery to take place on a Saturday or Sunday. What would be the best way to model this? Mark forReview

(1) Points

Use a Delivery Day entity, which holds prices against week days, and ensure the we also have anattribute for the Requested Delivery Day in the Order Entity. (*)

Email current price to all employees whenever the prices change.

Update the prices in the system, print out the current prices when they change and pin them on thecompany noticeboard

Allow them to enter whatever delivery charge they want.

2222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222


1. The main subject areas taught by the Oracle Academy are: Mark for Review(1) Points

Computer Repairs





2. Consider your school library. It will have a database with transaction details of which studentborrows which books. Is details of the total number of books out on loan in one given month Data orInformation? Mark for Review

(1) Points

Data


41/150


42/150

Gender

Natacha Hansen (*)

8. All of the following are examples of ENTITY: Instance except two. Select the answers that are

ENTITY: Instance. (Choose Two) Mark for Review(1) Points


TRANSPORTATION METHOD: Car (*)

ANIMAL: Dog (*)

MEAT PRODUCT: Lettuce

BODY PART: Larry Ellison

9. Primary Unique Identifiers (Choose Two) Mark for Review(1) Points


Are Required. The data model is not complete until all entities have a Primary UID. (*)

Distinguish each instance of an entity from all others (*)

Are not required

You may create more than one Primary Unique Identifier for an entity

10. A/an _________ is a picture of all the information that will form the basis for the finished system.Mark for Review(1) Points

ERD (*)

Process

Table

Attribute


11. An entity can have many Unique Identifiers. True or False? Mark for Review

(1) Points

True (*)

False

12. Volatile entities have special requirements and need special attention when you are doing datamodelling. True or False? Mark for Review(1) Points

True (*)


43/150

False

13. Which of the following statements about relationships are true? (Choose Two) Mark for Review(1) Points


They become Foreign Keys in the database. (*)

They Must be Mandatory to be created in the database.




14. Relationship Names are optional. True or False?

Mark for Review(1) PointsTrue

False (*)

15. In a business that sells pet food choose the best relationship name between FOOD TYPE andANIMAL (e.g. dog, horse or cat). (Choose Two) Mark for Review(1) Points


Each FOOD TYPE must be suitable for one or more ANIMALs. (*)

Each ANIMAL must be the seller of one or more FOOD TYPES.

Each FOOD TYPE may be made from one or more ANIMALs.

Each FOOD TYPE may be given to one or more ANIMALs. (*)

Section 3 Lesson 2

(Answer all questions in this section)

16. Entity names are always singular. True or False? Mark for Review(1) Points

True (*)

False

17. All the Attributes in a system are just written on the ERD, and they all go in the Top Left HandCorner of the paper. True or False? Mark for Review(1) Points

True

False (*)

Section 3 Lesson 3


18. When reading an ERD including Relationships you are said to be speaking: Mark for Review


44/150

(1) Points

Relationship-ish

Gibberish

ERDish (*)

Entity-ish


19. All instances of the supertype must be an instance of one of the subtypes. True or False? Mark forReview(1) Points

True (*)

False

20. When creating entities you must follow these rules: (Choose Two) Mark for Review

(1) Points


Name them in Plural


Exclude Attributes



21. All instances of a subtypes may be an instance of the supertype but does not have to. True or False?Mark for Review

(1) Points

True

False (*)

22. A supertype can only have two subtypes and no more. True or False? Mark for Review(1) Points

True

False (*)

23. All ER diagrams must have one of each of the following: (Choose two) Mark for Review(1) Points


One or more Entities (*)

Relationships between entities (*)


45/150

Arcs

At least one supertype and subtype

Section 4 Lesson 2


24. Can all constraints be modeled on an ER diagram? Mark for Review(1) Points

No, in which case you should let the database administrator handle them

No, but you just explain them to the users so they can enforce them

Yes, all constraints must be modeled and shown on the ER diagram

No, so you should list them on a separate document to be handled programmatically (*)

25. A new system would have a mixture of both Procedural and Structural Business Rules as part of thedocumentation of that new system. True or False? Mark for Review(1) Points

True (*)

False

26. Why is it important to identify and document structural rules? Mark for Review(1) Points

Ensures we know what data to store and how that data works together. (*)

Ensures nothing. There is no benefits to be gained from documenting your Structural Business Rules.We need to concentrate on the Procedural Business Rules only.

Ensures we know what Information to store and how that Information works together.

All of the Above.

27. Business rules are important to data modelers. True or False? Mark for Review(1) Points

True (*)

False


28. A Diamond on a relationship indicates the Relationship as Non-Tranferrable. True or False? Markfor Review(1) Points

True (*)

False



46/150

29. Which of the following pairs of entities is most likely to be modeled as a M:M relationship? Markfor Review(1) Points

CAR and WHEEL

TREE and BRANCH



30. Relationships can be Redundant. True or False? Mark for Review

(1) Points

True (*)

False


31. What uncommon relationship is described by the statements: Each DNA SAMPLE may be takenfrom one and only one PERSON and each PERSON may provide one and only one DNA SAMPLEMark for Review(1) Points





32. If two entities have two relationships between them, these relationships can be either __________or __________? Mark for Review(1) Points

Redundant or Required (*)

Replicated or Required

Resourced and Really Good

Redundant and Replicated

Section 6 Lesson 1


33. All entities must be given a new artificial UID. True or False?Mark for Review(1) PointsTrueFalse (*)

Section 6 Lesson 2


34. When data is stored in one place in a database, the database conforms to the rules of ___________.


47/150


Normality

Reduction

Normalization (*)

Multiplication


35. Would it be a good idea to model age as an attribute of STUDENT Mark for Review(1) Points

Yes


Sometimes



36. Which of the following is NOT a relationship type? Mark for Review(1) Points

Some to None (*)

One to One

One to Many

Many to Many

37. Consider the entity ADDRESS with the attributes:ADDRESS:# House Number* Street* Town* City* Year of Buildo City Population

This entity is NOT in 3rd Normal Form (no non-UID attribute can be dependent on another non-UIDattribute). True or False?Mark for Review(1) Points

True (*)

False

38. Which of the following would best be represented by an arc? Mark for Review(1) Points


48/150


DELIVERY ADDRESS ( Home, Office) (*)

PARENT (Girl, Bob)


39. Arcs are used to visually represent _________ between two or more relationships in an ERD. Markfor Review(1) Points

Sameness

Differencies

Exclusivity (*)

An Arc is what Noah sailed on with all the animals.

40. No parts of a UID are mandatory. True or False? Mark for Review(1) Points

True

False (*)


41. A relationship can be both Recursive and Hierarchal at the same time. True or False? Mark for

Review

(1) Points

True

False (*)

Section 7 Lesson 3


42. If Audit trail attributes are added to an entity they must be in the entities they are auditing. True orFalse? Mark for Review(1) Points

True (*)

False


43. Database Design projects must use Consultants or they will fail. True or False? Mark for Review(1) Points

True

False (*)

Section 8 Lesson 2


49/150


44. Your apperance at a presentation is important. You need to look smart and presentable. True orFalse? Mark for Review(1) Points

True (*)

False


45. If a system includes the concept of time, and it stores Start Dates, then End Dates becomesMandatory. For each Start Date attribute you create, you MUST create an End Date attribute and itmust be mandatory. True or False? Mark for Review(1) Points

True

False (*)

46. There is only one way to model time in a Data Model. True or False? Mark for Review(1) Points

True

False (*)


True (*)

False

48. Which of the following would be a logical constraint when modeling time for a City entity? Markfor Review(1) Points

People are born in the city and people die in the city.

Cites may change their name and/or which country they are placed in, if the borders of a countrychange. (*)

If you are doing a system for any French City, you would need security clearance

You need a constant record of cities because they are still cities, even if leadership changes over time,

e.g. they get a new Mayor


49. All systems must include functionality to provide logging or journaling in conceptual data models.True or False? Mark for Review(1) Points

True

False (*)


50/150

50. Why would you want to model a time component when designing a system that lets people buyshares via the Internet? (Choose Two) Mark for Review(1) Points


This would only be required in the US to allow the New York Stock Exchange to be notified of thisinformation.

To allow the sales people to determine when the shared were bought and therefore at what price. (*)

You would not want to model this, it is not important.

The price of shares fluctuates and for determining price, you need to know the time of purchase (*)1. Once you have learned how to write programs and build systems, you no longer need any input orinvolvement from any users, as you are perfectly capable of delivering the systems the business needsand wants.- True. All that perfect systems need are correct programs.

- False. Business requirements can and will change. For instance new legal requirements may arise. (*)- True. All users do is delay systems delivery with their forever changing minds and new requirements.- True. Users never know what they want anyway, so building systems are best left to the professionals.

2. Information which was gained from data is the same as: (Choose Two)- Knowledge (*)- Raw Materials- Intelligence (*)- There is no difference between data and information3. Consider your school library. It will have a database with transaction details of which studentborrows which books. Is details of the total number of books out on loan in one given month Data orInformation?- Data

- Information (*)

- Both- Neither4. The first step in system development is to document the requirements. Why?- Wrong. A blueprint for the database design is not needed. We can just start coding straight away- It clarifies what a business wants to accomplish, and provides measures for deciding if the systemdelivers all that is required. (*)- It allows application development to be conducted without having to consider database design.

- It keeps businesses honest5. Databases were invented in 1989. True or False?- True- False (*)6. Oracle Database Software do not provide or does not comprise of which functionality?- Graphical User Interface- Internet Browser- Server- Operating System (*)

7. An entity is instantiated as a ?- experience- instance- table (*)- none of the above8. Relationship names are usually verbs. True or False?- True (*)- False9. The entity/relationship model is created before the physical database design model. True or False?

- True (*)- False10. All of the following could be attributes of an ENTITY called PERSON except one. Select the


51/150

incorrect one:- Haircolor- Weight- Gender- Natacha Hansen (*)

11. An entity can have many Unique Identifiers. True or False?

- True (*)- False12. Volatile entities have special requirements and need special attention when you are doing datamodelling. True or False?- True (*)- False13. Which of the following entities most likely contains valid attributes?

- Entity: Home. Attributes: Number of Bedrooms, Owner, Address, Date Built (*)- Entity: Pet. Attributes: Name, Birthdate, Owner (*)- Entity: Car. Attributes: Owner Occupation, Owner Salary, Speed- Entity: Mother. Attributes: Name, Birthdate, Occupation, Salary14. Relationship Names are optional. True or False?- True

- False (*)15. Which of the following are valid relationship degrees- 1:1 (*)

- 1:M (*)- 1:O- O:O16. Which symbol is used to show that a particular attribute is mandatory?- * (*)- O- #- &17. The many end of a Relationship is called:

- Gulls Foot

- Pigs Ear- Crows Ear- Crows Foot (*)18. When reading a relationship between 2 entities, the relationship is read both from left to right andright to left. True or False?- True (*)- False

19. All ER diagrams must have one of each of the following:- One or more Entities (*)- Relationships between entities (*)- Arcs- At least one supertype and subtype20. Which of the following are suitable Entity names? (Choose Two)- DOGS- ANIMAL (*)- ANIMALS

- DOG (*)21. Which of the following is true about subtypes?- One instance may belong to two subtypes of the same supertype.- Subtypes must be mutually exclusive. (*)- Subtypes must not be mutually exclusive.- Subtype entities may not have relationships to the other subtype entities, only the supertype itself.22. All instances of the supertype must be an instance of one of the subtypes. True or False?- True (*)- False

23. All instances of the subtypes can be an instance of the supertype but do not have to. True or False?- True- False (*)


52/150

24. How would you model a business rule that states that girls and boys may not attend classestogether?- Use a supertype- Use two subtypes with relationships from class to student gender (*)- Make the attribute Gender mandatory

- You cannot model this. You need to document it.

25. Can all constraints be modeled on an ER diagram?- No, in which case you should let the database administrator handle them- No, but you just explain them to the users so they can enforce them- Yes, all constraints must be modeled and shown on the ER diagram- No, so you should list them on a separate document to be handled programmatically (*)26. Business rules are not important to data modelers. True or False?- True

- False (*)27. Why is it important to identify and document structural rules?- Ensures we know what data to store and how that data interrelate. (*)- Ensures nothing. There is no benefits to be gained from documenting your Structural Business Rules.We need to concentrate on the Procedural Business Rules only.- Ensures we know what Information to store and how that Information interrelate.

- All of the Above.28. A non-transferable relationship means the detail cannot be changed to point to a new master. Trueor False?

- True (*)- False29. If two entities have two relationships between them, these relationships can be either_____________ or _____________ ? (Choose Two)- Redundant or Required (In which case they would depict different relationships) (*)- Replicated or Required (In which case they would depict different relationships)- Resourced and Really Good- Redundant and Replicated30. What uncommon relationship is described by the statements: Each DNA SAMPLE may be taken

from one and only one PERSON and each PERSON may provide one and only one DNA SAMPLE

- One to Many Optional- One to Many Mandatory- One to One Optional (*)- Many to Many Mandatory31. How do you include a relationship as part of the UID for an entity?- By barring the relationship in question (*)- By reporting it in an external document

- By including the UID from the parent entity as an attribute in the entity- You cannot model that.32. Many to many relationships must be left in the Model. It is important to have them documented asM-M. True or False?- True- False (*)33. The first UID for an entity is called the Primary UID, the second is called Secondary UID and soon.- Yes, this is the way UIDs are named. (*)

- No, it is not possible to have more than one UID for an Entity.- Yes, but then it stops. No entities can have more than two UIDs.- No, each Entity can only have one UID, the secondary one.34. When data is stored in one place in a database, the database conforms to the rules of- Normality- Reduction- Normalization (*)- Multiplication35. When is an entity in 2nd Normal Form?

- When all non-UID attributes are dependent upon the entire UID. (*)- When no attritibutes are mutually independant and fully independent on the primary key.- When no attritibutes are mutually independent and all are fully dependent on the primary key.


53/150

- None of the Above.36. No parts of a UID are mandatory. True or False?- True- False (*)37. Which of the following is NOT a relationship type?

- Some to None (*)

- One to One- One to Many- Many to Many38. All relationships participating in an arc must be mandatory. True or False?- True- False (*)39. Which of the following would best be represented by an arc?

- STUDENT (Female, Bob)- DELIVERY ADDRESS ( Home, Office) (*)- PARENT (Girl, Bob)- STUDENT (Grade A student, Average Student)40. Arcs are Mandatory in Data modelling. All ERDs must have at least one Arc. True or False?- True

- False (*)41. Which of the following would be good as a Unique Identifier for its Entity?- Personal Identification number for Person (*)

- Vehicle Registration Number for Car (*)- ISBN Number for Book (*)- Date of birth for Baby42. Modeling historical data can produce a unique identifier that always excludes dates. True or False?- True- False (*)43. Consultants often use their experience in ensuring projects stay on track and delivers within thetimescales set out for the project. True or False?- True (*)

- False

44. Your apperance at a presentation is important. You need to look smart and presentable. True orFalse?- True (*)- False45. Which of the following would be a logical constraint when modeling time for a City entity?- People are born in the city and people die in the city.- Cites may change their name and/or which country they are placed in, if the borders of a country

change. (*)- If you are doing a system for any French City, you would need security clearance- You need a constant record of cities because they are still cities, even if leadership changes over time,e.g. they get a new Mayor46. If a system includes the concept of time, and it stores Start Dates, then End Dates becomesMandatory. For each Start Date attribute you create, you MUST create an End Date attribute and itmust be mandatory. True or False?- True- False (*)

47. Modeling historical data is Optional. True or False?- True (*)- False48. What do users of a system without the concept of time loose?- Journalling becomes much easier.- Journalling becomes slightly harder.- The ability to track data over time. (*)- Nothing is lost if a system does not track time.49. Why would you want to model a time component when designing a system that lets people buy

shares via the Internet?- This would only be required in the US to allow the New York Stock Exchange to be notified of thisinformation.


54/150

- To allow the sales people to determine when the shared were bought and therefore at what price. (*)- You would not want to model this, it is not important.- The price of shares fluctuates and for determining price, you need to know the time of purchase (*)50. You are doing a data model for a computer sales company, where the price of postage is ependanton what day of the week goods are shipped. So shipping is more expensive if the customer wants a

delivery to take place on a Saturday or Sunday. What would be the best way to model this?

- Use a Delivery Day entity, which holds prices against week days, and ensure the we also have anattribute for the Requested Delivery Day in the Order Entity. (*)- Email current price to all employees whenever the prices change.- Update the prices in the system, print out the current prices when they change and pin them on thecompany noticeboard- Allow them to enter whatever ever delivery charge they want.

Section 1 Lesson 1


1.You query the database with this SQL statement:

SELECT CONCAT(last_name, (SUBSTR(LOWER(first_name), 4))) Default PasswordFROM employees;Which function will be evaluated first? Mark for Review

(1) Points

CONCAT

SUBSTR

LOWER (*)

All three will be evaluated simultaneously.

Correct

2.Evaluate this SELECT statement:SELECT LENGTH(email)FROM employee;What will this SELECT statement display?

The longest e-mail address in the EMPLOYEE table.

The email address of each employee in the EMPLOYEE table.

The number of characters for each value in the EMAIL column in the employees table. (*)

The maximum number of characters allowed in the EMAIL column.

Correct

3.You issue this SQL statement:SELECT INSTR (organizational sales, al)FROM dual;Which value is returned by this command?

1

2


55/150

13 (*)

17

Correct

4.You need to display the number of characters in each customers last name. Which function should youuse?

LENGTH (*)\\

LPAD

COUNT

SUBSTR

Correct

5.

The PRICE table contains this data:PRODUCT_ID MANUFACTURER_ID86950 59604You query the database and return the value 95. Which script did you use? s

SELECT SUBSTR(product_id, 3, 2)FROM priceWHERE manufacturer_id = 59604; (*)

SELECT LENGTH(product_id, 3, 2)

FROM priceWHERE manufacturer_id = 59604;

SELECT SUBSTR(product_id, -1, 3)FROM priceWHERE manufacturer_id = 59604;

SELECT TRIM(product_id, -3, 2)FROM priceWHERE manufacturer_id = 59604;

Correct

6.Which three statements about functions are true? (Choose three.)


The SYSDATE function returns the Oracle Server date and time. (*)

The ROUND number function rounds a value to a specified decimal place or the nearest wholenumber. (*)

The CONCAT function can only be used on character strings, not on numbers.

The SUBSTR character function returns a portion of a string beginning at a defined character positionto a specified length. (*)


56/150

Correct

7.Which SQL function can be used to remove heading or trailing characters (or both) from a characterstring?

LPAD

CUT

NVL2

TRIM (*)

Correct

Section 1 Lesson 2


8.Which comparison operator retrieves a list of values?

IN (*)

LIKE

BETWEENIN

IS NULL

Correct

9.You issue this SQL statement:SELECT TRUNC(751.367,-1)FROM dual;Which value does this statement display?

700

750 (*)

751

751.3

Correct

10.You issue this SQL statement:SELECT ROUND (1282.248, -2)FROM dual;What value does this statement produce?

1200

1282

1282.25


57/150


58/150

SELECT (30 + hire_date) + 1440/24FROM employees;

SELECT (SYSDATE hire_date) + 10*8

FROM employees; (*)

SELECT SYSDATE TO_DATE(25-JUN-02!) + hire_dateFROM employees;

SELECT (hire_date SYSDATE) + TO_DATE(25-JUN-02!)

FROM employees;

Correct

15.The EMPLOYEE table contains these columns:LAST_NAME VARCHAR2(20)FIRST_NAME VARCHAR2(20)

HIRE_DATE DATEEVAL_MONTHS NUMBER(3)Evaluate this SELECT statement:SELECT hire_date + eval_monthsFROM employee;The values returned by this SELECT statement will be of which data type?

DATE (*)

NUMBER

DATETIME

INTEGER

Incorrect. Refer to Section 1

Section 2 Lesson 1


16.The EMPLOYEES table contains these columns:EMPLOYEE_ID NUMBER(9)LAST_NAME VARCHAR2 (25)FIRST_NAME VARCHAR2 (25)

HIRE_DATE DATEYou need to display HIRE_DATE values in this format:January 28, 2000Which SELECT statement could you use? Mark for Review(1) Points

SELECT TO_CHAR(hire_date, Month DD, YYYY)FROM employees;

SELECT TO_CHAR(hire_date, Month DD, YYYY)FROM employees;(*)

SELECT hire_date(TO_CHAR Month DD, YYYY)FROM employees;


59/150

SELECT TO_CHAR(hire_date, Month DD, YYYY)FROM employees;

Correct

17.Which statement concerning single row functions is true?

Single row functions can accept only one argument, but can return multiple values.

Single row functions cannot modify a data type.

Single row functions can be nested. (*)

Single row functions return one or more results per row.


18.You have been asked to create a report that lists all customers who have placed orders of at least$2,500. The reports date should be displayed in the Day, Date Month, Year format (For example,

Tuesday, 13 April, 2004 ). Which statement should you issue?

SELECT companyname, TO_CHAR (sysdate, fmdd, dy month, yyyy), totalFROM customers NATURAL JOIN ordersWHERE total >= 2500;

SELECT companyname, TO_DATE (date, day, dd month, yyyy), totalFROM customers NATURAL JOIN ordersWHERE total >= 2500;

SELECT companyname, TO_DATE (sysdate, dd, dy month, yyyy), totalFROM customers NATURAL JOIN ordersWHERE total >= 2500;

SELECT companyname, TO_CHAR (sysdate, fmDay, dd Month, yyyy), totalFROM customers NATURAL JOIN ordersWHERE total >= 2500; (*)

Correct

19.Which two statements concerning SQL functions are true? (Choose two.)


Character functions can accept numeric input.

Not all date functions return date values. (*)

Number functions can return number or character values.

Conversion functions convert a value from one data type to another data type. (*)

Single-row functions manipulate groups of rows to return one result per group of rows.


20.


60/150

All Human Resources data is stored in a table named EMPLOYEES. You have been asked to create areport that displays each employees name and salary. Each employees salary must be displayed in thefollowing format: $000,000.00. Which function should you include in a SELECT statement to achievethe desired result?

TO_CHAR (*)

TO_DATE

TO_NUMBER

CHARTOROWID

Correct

Section 2 Lesson 2


22.The STYLES table contains this data:STYLE_ID STYLE_NAME CATEGORY COST

895840 SANDAL 85940 12.00968950 SANDAL 85909 10.00869506 SANDAL 89690 15.00809090 LOAFER 89098 10.00890890 LOAFER 89789 14.00857689 HEEL 85940 11.00758960 SANDAL 86979Evaluate this SELECT statement:SELECT style_id, style_name, category, cost

FROM styles

WHERE style_name LIKE SANDAL AND NVL(cost, 0) < 15.00ORDER BY category, cost;Which result will the query provide?

STYLE_ID STYLE_NAME CATEGORY COST895840 SANDAL 85940 12.00968950 SANDAL 85909 10.00

758960 SANDAL 86979

STYLE_ID STYLE_NAME CATEGORY COST895840 SANDAL 85909 12.00968950 SANDAL 85909 10.00869506 SANDAL 89690 15.00758960 SANDAL 86979

STYLE_ID STYLE_NAME CATEGORY COST

895840 SANDAL 85909 12.00968950 SANDAL 85909 10.00758960 SANDAL 86979869506 SANDAL 89690 15.00

STYLE_ID STYLE_NAME CATEGORY COST968950 SANDAL 85909 10.00895840 SANDAL 85940 12.00758960 SANDAL 86979

Correct23.


61/150

When executed, which statement displays a zero if the TUITION_BALANCE value is zero and theHOUSING_BALANCE value is null?

SELECT NVL (tuition_balance + housing_balance, 0) Balance DueFROM student_accounts; (*)

SELECT NVL(tuition_balance, 0), NVL (housing_balance), tuition_balance + housing_balanceBalance DueFROM student_accounts;

SELECT tuition_balance + housing_balanceFROM student_accounts;

SELECT TO_NUMBER(tuition_balance, 0), TO_NUMBER (housing_balance, 0), tutition_balance +housing_balance Balance DueFROM student_accounts;

Correct

24.You need to replace null values in the DEPT_ID column with the text N/A. Which functions shouldyou use?

TO_CHAR and NVL (*)

TO_CHAR and NULL

TO_CHAR and NULLIF

TO_NUMBER and NULLIF

Correct

Section 3 Lesson 2


25.You have been asked to create a report that lists all corporate customers and all orders that they have

placed. The customers should be listed alphabetically beginning with the letter A, and theircorresponding order totals should be sorted from the highest amount to the lowest amount.Which of the following statements should you issue? Mark for Review(1) Points

SELECT c.custid, c.companyname, o.orderdate, o. custid, o.amountFROM customers c, orders oWHERE c.custid = o.custidORDER BY amount DESC, companyname;

SELECT c.custid, c.companyname, o.orderdate, o. custid, o.amountFROM customers c, orders oWHERE c.custid = o.custidORDER BY companyname, amount DESC;(*)

SELECT c.custid, c.companyname, o.orderdate, o. custid, o.amountFROM customers c, orders o

WHERE c.custid = o.custidORDER BY companyname, amount;


62/150

SELECT c.custid, c.companyname, o.orderdate, o. custid, o.amountQ FROM customers c, orders oWHERE c.custid = o.custidORDER BY companyname ASC, amount ASC;

Correct

26.Your company stores its business information in an Oracle9i database. The EMPLOYEES tableincludes the following columns:EMP_ID NUMBER(5) NOT NULL PRIMARY KEYFNAME VARCHAR2(25)LNAME VARCHAR2(25)

ADDRESS VARCHAR2(35)CITY VARCHAR2(25)STATE VARCHAR2(2)ZIP NUMBER(9)TELEPHONE NUMBER(10)DEPT_ID NUMBER(5) NOT NULL FOREIGN KEY

The BONUS table includes the following columns:BONUS_ID NUMBER(5) NOT NULL PRIMARY KEYANNUAL_SALARY NUMBER(10)

BONUS_PCT NUMBER(3, 2)EMP_ID VARCHAR2(5) NOT NULL FOREIGN KEYYou want to determine the amount of each employees bonus. Which of the following queries shouldyou issue?

SELECT e.fname, e.lname, b.annual_salary * b. bonus_pctFROM employees e, bonus bWHERE e.emp_id = b.emp_id; (*)

SELECT e.fname, e.lname, b.annual_salary, b. bonus_pct

FROM employees e, bonus bWHERE e.emp_id = b.emp_id;

SELECT e.fname, e.lname, b.annual_salary, b. bonus_pctFROM employees, bonusWHERE e.emp_id = b.emp_id;

SELECT fname, lname, annual_salary * bonus_pctFROM employees, bonus NATURAL JOIN;


27.What is produced when a join condition is not specified in a multiple-table query?

a self-join

an outer join

an equijoin

a Cartesian product (*)

Correct

28.The CUSTOMERS and SALES tables contain these columns:CUSTOMERS


63/150

CUST_ID NUMBER(10) PRIMARY KEYCOMPANY VARCHAR2(30)LOCATION VARCHAR2(20)SALESSALES_ID NUMBER(5) PRIMARY KEY

CUST_ID NUMBER(10) FOREIGN KEY

TOTAL_SALES NUMBER(30)Which SELECT statement will return the customer ID, the company and the total sales?

SELECT c.cust_id, c.company, s.total_salesFROM customers c, sales sWHERE c.cust_id = s.cust_id (+);

SELECT cust_id, company, total_salesFROM customers, salesWHERE cust_id = cust_id;

SELECT c.cust_id, c.company, s.total_salesFROM customers c, sales s

WHERE c.cust_id = s.cust_id; (*)

SELECT cust_id, company, total_sales

FROM customers c, sales sWHERE c.cust_id = s.cust_id;

Correct

29.Which statement about the join syntax of a SELECT statement is true?

The ON keyword must be included.

The JOIN keyword must be included.

The FROM clause represents the join criteria.

The WHERE clause represents the join criteria. (*)

Correct

30.When joining 3 tables in a SELECT statement, how many join conditions are needed in the WHEREclause? Mark for Review(1) Points

0

1

2 (*)

3

Correct

Section 3 Lesson 4


31.


64/150

Which statement about outer joins is true? Mark for Review(1) Points

The tables must be aliased.

The FULL, RIGHT, or LEFT keyword must be included.

The OR operator cannot be used to link outer join conditions. (*)

Outer joins are always evaluated before other types of joins in the query.

Correct

32.Which two operators can be used in an outer join condition using the outer join operator (+)? Mark forReview(1) Points

AND and = (*)

OR and =

BETWEENAND and IN

IN and =


33.Which operator would you use after one of the column names in the WHERE clause when creating anouter join? Mark for Review

(1) Points

(+) (*)

*

+

=

Correct

Section 4 Lesson 2


34.

Which of the following best describes a natural join? Mark for Review(1) Points

A join between two tables that includes columns that share the same name, datatypes and lengths (*)

A join that produces a Cartesian product

A join between tables where matching fields do not exist

A join that uses only one table

Correct


65/150

35.You need to join two tables that have two columns with the same name and compatible data types.Which type of join would you create to join the tables on both of the columns? Mark for Review(1) Points

Natural join (*)

Cross join

Outer join

Self-join

Correct

36.Which of the following conditions will cause an error on a NATURAL JOIN? Mark for Review(1) Points

When you attempt to write it as an equijoin.

When the NATURAL JOIN clause is based on all columns in the two tables that have the same name.

If it selects rows from the two tables that have equal values in all matched columns.

If the columns having the same names have different data types, then an error is returned. (*)

Correct

Section 4 Lesson 3


37.Which SELECT clause creates an equijoin by specifying a column name common to both tables? Markfor Review(1) Points

A HAVING clause

The FROM clause

The SELECT clause

A USING clause (*)


38.The primary advantage of using JOIN ON is: Mark for Review(1) Points

The join happens automatically based on matching column names and data types

It will display rows that do not meet the join condition

It permits columns with different names to be joined (*)

It permits columns that dont have matching data types to be joined


66/150

Correct

39.Evaluate this SELECT statement:

SELECT a.lname || , || a.fname as Patient, b.lname || , || b.fname as Physician, c.admission

FROM patient aJOIN physician bON (b.physician_id = c.physician_id);JOIN admission cON (a.patient_id = c.patient_id);Which clause generates an error? Mark for Review(1) Points

JOIN physician b

ON (b.physician_id = c.physician_id); (*)

JOIN admission c

ON (a.patient_id = c.patient_id)


40.Below find the structure of the CUSTOMERS and SALES_ORDER tables:CUSTOMERSCUSTOMER_ID NUMBER NOT NULL, Primary KeyCUSTOMER_NAME VARCHAR2 (30)CONTACT_NAME VARCHAR2 (30)CONTACT_TITLE VARCHAR2 (20)

ADDRESS VARCHAR2 (30)

CITY VARCHAR2 (25)REGION VARCHAR2 (10)POSTAL_CODE VARCHAR2 (20)COUNTRY_ID NUMBER Foreign key to COUNTRY_ID column of the COUNTRY tablePHONE VARCHAR2 (20)FAX VARCHAR2 (20)CREDIT_LIMIT NUMBER(7,2)

SALES_ORDERORDER_ID NUMBER NOT NULL, Primary KeyCUSTOMER_ID NUMBER Foreign key to CUSTOMER_ID column of the CUSTOMER tableORDER_DT DATEORDER_AMT NUMBER (7,2)SHIP_METHOD VARCHAR2 (5)You need to create a report that displays customers without a sales order. Which statement could youuse? Mark for Review(1) Points

SELECT c.customer_nameFROM customers cWHERE c.customer_id not in (SELECT s.customer_id FROM sales_order s);(*)

SELECT c.customer_nameFROM customers c, sales_order sWHERE c.customer_id = s.customer_id(+);

SELECT c.customer_nameFROM customers c, sales_order s


67/150

WHERE c.customer_id (+) = s.customer_id;

SELECT c.customer_nameFROM customers cRIGHT OUTER JOIN sales_order s ON (c.customer_id = s.customer_id);


Section 4 Lesson 4


41.

You need to join the EMPLOYEE_HIST and EMPLOYEE tables. The EMPLOYEE_HIST table wi

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