Raspunsuri Oracle Blogspot Com 2009 01 Raspunsuri Oracle Mid

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J O I , 2 9 I A N U A R I E 2 0 0 9

RASPUNSURI ORACLE MID EXAM Design

RASPUNSURI ORACLE FINAL EXAM Design

Oracle Academy Database Design ‐ Student

Final Term Exam Semester 1

Section 12

1. The explanation below is a column integrity constraint:

A column must contain only values consistent with the defined data

format of the column. True or False?

Mark for Review

(1) Points

True (*)

False

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Correct

2. Identify all of the incorrect statements that complete this

sentence: A primary key is: (Choose three) Mark for Review

(1) Points

(Choose all correct answers)

A single column that uniquely identifies each column in a table (*)

One or more columns in a table that uniquely identifies each row in

that table

A set of columns in one table that uniquely identifies each row in

another table (*)

Only one column that must be null (*)

Correct

3. The explanation below is a User Defined integrity rule and must

therefore be manually coded, the Database cannot enforce this rule

automatically:

A primary key must be unique, and no part of the primary key can be

null. True or False?








Mark for Review

(1) Points

True

False (*)

Correct

4. The text below is an example of what constraint type:

The value in the manager_id column of the EMPLOYEES table must

match a value in the employee_id column in the EMPLOYEES table.

Mark for Review

(1) Points

Entity integrity

User‐defined integrity

Column integrity

Referential integrity (*)

Incorrect. Refer to Section 12








5. In a physical data model, an attribute becomes a _____________.

Mark for Review

(1) Points

Table

Foreign Key

Constraint

Column (*)

Correct

6. The transformation from an ER diagram to a physical design

involves changing terminology. Primary Unique Identifiers in the ER

diagram become __________ and relationships become

____________. Mark for Review

(1) Points

Foreign keys, Primary keys

Primary keys, Foreign keys (*)

Foreign keys, mandatory business rules








Unique Keys, Primary keys

Correct

7. In a physical data model, a relationship is represented as a

combination of: (Choose Two) Mark for Review

(1) Points

(Choose all correct answers)

Column

Primary Key or Unique Key (*)

Check Constraint or Unique Key

Foreign Key (*)

Correct

8. It is possible to implement non‐transferability via a s imple Foreign

Key Relationship. True or False? Mark for Review

(1) Points








True

False (*)

Correct

9. Many to many relationships are implemented via a structure called

a: ________________ Mark for Review

(1) Points

Supertype

Intersection Table (*)

Intersection Entity

Subtype


10. When mapping supertypes, relationships at the supertype level

transform as usual. Relationships at subtype level are implemented

as foreign keys, but the foreign key columns all become mandatory.








True or False? Mark for Review

(1) Points

True

False (*)

Correct

Section 12

11. Which of the following are reasons why you should consider using

a Subtype Implementation? Mark for Review

(1) Points

The resulting table will reside in a single database and be used by

just ONE user.

When the common access paths for the supertypes are different.

Business functionality and business rules, access paths and frequency

of access are all very different between subtypes. (*)

Most of the relationships are at the supertype level








Correct

Section 13

12. The _______ clause can be added to a SELECT statement to

return a subset of the data. Mark for Review

(1) Points

ANYWHERE

WHICH

WHERE (*)

EVERY

Correct.

13. The DESCRIBE command returns all rows from a table. True or

False? Mark for Review

(1) Points

True







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False (*)


Section 16

14. Which SQL keyword specifies that an alias will be substituted for

a column name in the output of a SQL query? Mark for Review

(1) Points

AS (*)

OR

AND

SUBSTITUTE

Correct.

15. You query the database with this SQL statement:







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SELECT *

FROM transaction

WHERE product_id = 4569;

Which SQL SELECT statement capabilities are achieved when this

statement is executed?

Mark for Review

(1) Points

Selection only (*)

Projection only

Selection and projection only

Projection, selection and joining

Incorrect. See Section 16

16. Evaluate this SELECT statement:SELECT (salary * raise_percent) raise

FROM employees;

If the RAISE_PERCENT column only contains null values, what will the

statement return?

Mark for Review







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(1) Points

Only zeroes

Only null values (*)

A null value or a zero depending on the value of the SALARY column

A null value or a numeric value depending on the value of the SALARY

column

Correct.

17. What would you use in the SELECT clause to return all the

columns in the table? Mark for Review

(1) Points

An asterisk (*) (*)

A minus sign (‐)

A plus sign (+)

The ALL keyword






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Correct.

18. When you use the SELECT clause to list one or two columns only

from a table and no WHERE clause, which SQL capability is used?

Mark for Review

(1) Points

Joining only

Selection only

Projection only (*)

Projection and Selection

Correct.

19. In a SELECT clause, what is the result of 2 + 3 * 2? Mark for

Review(1) Points

6

8 (*)






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10

13

Correct.

20. You query the database with this SQL statement:

SELECT * FROM students;

Why would you use this statement?

Mark for Review

(1) Points

To insert data

To view data (*)

To display the table structure

To delete data

Correct.

Section 16

21 A N UID b d d h i UID T F l ?






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21. Any Non‐UID must be dependant on the entire UID. True or False?

Mark for Review

(1) Points

True (*)

False

Correct

22. 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.







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Section 17

23. What does the DISTINCT keyword do when it is used in a SELECT

clause? Mark for Review

(1) Points

Hides NULL values

Eliminates all unique values and compares values

Eliminates duplicate rows in the result (*)

Eliminates only unique rows in the result

Correct. See Section 17

24. Which symbol represents the not equal to condition? Mark forReview

(1) Points

#

'+'







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!= (*)

~

Correct.

25. Which statement best describes how column headings are

displayed by default in Oracle Application Express : Mark for Review

(1) Points

Column headings are displayed left‐justified and in lowercase.

Column headings are displayed left‐justified and in uppercase.

Column headings are displayed centered and in uppercase. (*)

Column headings are displayed centered and in mixed case.


26. Which operator is used to combine columns of character strings

to other columns? Mark for Review

(1) Points







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*

/

+

|| (*)


27. You need to display employees whose salary is in the range of

30000 and 50000. Which comparison operator should you use? Markfor Review

(1) Points

IN

LIKE

BETWEEN...AND... (*)

IS NULL

Correct.








28. Which clause would you include in a SELECT statement to restrict

the data returned to only the employees in department 10? Mark for

Review

(1) Points

WHERE (*)

FROM

SELECT

IS

Correct.

29. Evaluate this SELECT statement:

SELECT *

FROM employeesWHERE department_id IN(10, 20, 30)

AND salary > 20000;

Which values would cause the logical condition to return TRUE?

Mark for Review

(1) Points








DEPARTMENT_ID = 10 and SALARY = 20000

DEPARTMENT_ID = 20 and SALARY = 20000

DEPARTMENT_ID = null and SALARY = 20001

DEPARTMENT_ID = 10 and SALARY = 20001 (*)


30. What will the result of the following SELECT statement be:

SELECT last_name, salary, salary + 300FROM employees;

How will the heading for the SALARY column appear in the display by

default in Oracle Application Express?

Mark for Review

(1) Points

Display the last name, salary and the results of adding 300 to eachsalary for all the employees (*)

Modify the salary column by adding 300 and displaying the last name,

salary and the new salary.

Modify the salary column by adding 300 and only display the last name

and the new salary.








and the new salary.

Display the last name, salary and the results of adding 300 to the

salary of the first employee row


Section 17

31. The PLAYERS table contains these columns:

PLAYER_ID NUMBER(9)

LAST_NAME VARCHAR2(20)

FIRST_NAME VARCHAR2 (20)TEAM_ID NUMBER (4)

MANAGER_ID NUMBER (9)

POSITION_ID NUMBER (4)

Which SELECT statement should you use if you want to display unique

combinations of the TEAM_ID and MANAGER_ID columns?

Mark for Review(1) Points

SELECT * FROM players;

SELECT team_id, manager_id FROM players;

SELECT DISTINCT team_id, manager_id FROM players; (*)








_ , g _ p y ; ( )

SELECT team_id, DISTINCT manager_id FROM players;

SELECT team_id, manager_id DISTINCT FROM players;

Correct.

32. You need write a SELECT statement that should only return rows

that contain 34, 46, or 48 for the DEPARTMENT_ID column. Which

operator should you use in the WHERE clause to compare the

DEPARTMENT_ID column to this specific list of values? Mark for

Review(1) Points

=

!=

IN (*)

BETWEEN..AND..

Correct.








33. Which SELECT statement will display both unique and non‐unique

combinations of the MANAGER_ID and DEPARTMENT_ID values from

the EMPLOYEES table? Mark for Review

(1) Points

SELECT manager_id, department_id DISTINCT FROM employees;

SELECT manager_id, department_id FROM employees; (*)

SELECT DISTINCT manager_id, department_id FROM employees;

SELECT manager_id, DISTINCT department_id FROM employees;

Incorrect. See Section 17.

34. The EMPLOYEES table contains these columns:

EMPLOYEE_ID NUMBER(9) PrimaryKey

LAST_NAME VARCHAR2 (20)

FIRST_NAME VARCHAR2 (20)

DEPARTMENT_ID NUMBER(5) NOT NULL

MANAGER_ID NUMBER(9) NOT NULL

Evaluate these two SELECT statements:

1. SELECT DISTINCT employee_id, department_id, manager_id FROM

employees;

2. SELECT employee_id, department_id, manager_id FROM








employees;

Which of the following statements is true?

Mark for Review

(1) Points

The two statements will display the same data. (*)

The first statement will display a particular DEPARTMENT_ID only

once.

The first statement will NOT display values from all of the rows in the

EMPLOYEES table

The second statement could display a unique combination of the

EMPLOYEE_ID, MANAGER_ID, and DEPARTMENT_ID values more than

once.


35. The STUDENT table contains these columns:

STUDENT_ID NUMBER(10) Primary Key

LAST_NAME VARCHAR2(25)

FIRST_NAME VARCHAR2(25)

MAIN_SUBJECT_ID NUMBER(3)

ADVISOR_ID NUMBER(5)








Evaluate this statement:

SELECT DISTINCT advisor_id, main_subject_id

FROM student;

Which statement is true?

Mark for Review

(1) Points

Each ADVISOR_ID can be displayed only once.

Each MAIN_SUBJECT_ID can be displayed more than once per

ADVISOR_ID. (*)

Each combination of ADVISOR_ID and MAIN_SUBJECT_ID can be

displayed more than once.

Each MAIN_SUBJECT_ID can be displayed only once per query.

Incorrect. See Section 17

36. The EMPLOYEES table includes these columns:

EMPLOYEE_ID NUMBER(4) NOT NULL

LAST_NAME VARCHAR2(15) NOT NULL

FIRST_NAME VARCHAR2(10) NOT NULL

HIRE_DATE DATE NOT NULL








You want to produce a report that provides the first names, last

names and hire dates of those employees who were hired between

March 1, 2000, and August 30, 2000. Which statements can you issue

to accomplish this task?

Mark for Review

(1) Points

SELECT last_name, first_name, hire_date

FROM employees

WHERE hire_date BETWEEN '01‐MAR‐00' AND '30‐AUG‐00';

(*)


FROM employees

WHERE hire_date BETWEEN '30‐AUG‐00' AND '01‐MAR‐00';


FROM employees

GROUP BY hire_date >= '01‐MAR‐00' and hire_date <= '30‐ AUG‐00';


FROM employees

AND hire_date >= '01‐MAR‐00' and hire_date <= '30‐AUG‐ 00';








Correct.

Section 18

37. Evaluate this SQL statement:

SELECT e.employee_id, e.last_name, e.first_name, m.manager_id

FROM employees e, employees m

ORDER BY e.last_name, e.first_name

WHERE e.employee_id = m.manager_id;

This statement fails when executed. Which change will correct the

problem?

Mark for Review

(1) Points

Reorder the clauses in the query. (*)

Remove the table aliases in the WHERE clause.

Remove the table aliases in the ORDER BY clause.

Include a HAVING clause.








Correct.

38. The PLAYERS table contains these columns:

PLAYERS TABLE:

LAST_NAME VARCHAR2 (20)

FIRST_NAME VARCHAR2 (20)

SALARY NUMBER(8,2)

TEAM_ID NUMBER(4)

MANAGER_ID NUMBER(9)

POSITION_ID NUMBER(4)

You want to display all players' names with position 6900 or greater.

You want the players names to be displayed alphabetically by lastname and then by first name. Which statement should you use to

achieve the required results?

Mark for Review

(1) Points

SELECT last_name, first_name

FROM players

WHERE position_id >= 6900

ORDER BY last_name, first_name;

(*)


FROM players

WHERE iti id 6900








WHERE position_id > 6900



FROM players

WHERE position_id <= 6900



FROM players

WHERE position_id >= 6900

ORDER BY last_name DESC, first_name;

Correct.


SELECT *

FROM employees

WHERE salary > 30000

AND department_id = 10

OR email IS NOT NULL;

Which statement is true?

Mark for Review

(1) Points








(1) Points

The OR condition will be evaluated before the AND condition.

The AND condition will be evaluated before the OR condition. (*)

The OR and AND conditions have the same precedence and will be

evaluated from left to right

The OR and AND conditions have the same precedence and will be

evaluated from right to left

Correct.


SELECT *

FROM employees

WHERE department_id = 34

OR department_id = 45

OR department_id = 67;

Which operator is the equivalent of the OR conditions used in this

SELECT statement?

Mark for Review

(1) Points

IN (*)








IN ( )

AND

LIKE

BETWEEN ... AND ...

Incorrect! See Section 18.

Section 18

41. You need to create a report to display all employees that werehired on or after January 1, 1996. The data should display in this

format:

Employee Start Date and Salary

14837 ‐ Smith 10‐MAY‐92 / 5000

Which SELECT statement could you use?

Mark for Review

(1) Points

SELECT employee_id || ‐ || last_name "Employee",

hire_date || / || salary "Start Date and Salary"

FROM employees

WHERE hire_date <= '01‐JAN‐96';








SELECT employee_id ||' '|| last_name "Employee",

hire_date ||' '|| salary "Start Date and Salary"

FROM employees


SELECT employee_id ||'"‐ "|| last_name "Employee",

hire_date ||" / "|| salary "Start Date and Salary"

FROM employees


SELECT employee_id ||' ‐ '|| last_name 'Employee',

hire_date ||' / '|| salary 'Start Date and Salary'

FROM employees


SELECT employee_id ||' ‐ '|| last_name "Employee",

hire_date ||' / '|| salary "Start Date and Salary"

FROM employees


(*)

Incorrect! See Section 18









42. You attempt to query the database with this SQL statement:

SELECT product_id "Product Number", category_id "Category", price

"Price"

FROM products

WHERE "Category" = 5570

ORDER BY "Product Number";

This statement fails when executed. Which clause contains a syntax

error?

Mark for Review

(1) Points

SELECT product_id "Product Number", category_id "Category", price

"price"

ORDER BY "Product Number";

FROM products

WHERE "Category" = 5570 (*)











SELECT employee_id, last_name, first_name, salary 'Yearly Salary'

FROM employees

WHERE salary IS NOT NULL

ORDER BY last_name, 3;

Which clause contains an error?

Mark for Review

(1) Points

SELECT employee_id, last_name, first_name, salary 'Yearly Salary' (*)

FROM employees

WHERE salary IS NOT NULL

ORDER BY last_name, 3;

Correct.


SELECT last_name, first_name, department_id, manager_id

FROM employees;

You need to sort data by manager id values and then alphabetically by

employee last name and first name values. Which ORDER BY clause

could you use?








y

Mark for Review

(1) Points

ORDER BY department_id, last_name

ORDER BY manager_id, last_name, first_name (*)

ORDER BY last_name, first_name, manager_id

ORDER BY manager_id, first_name, last_name

Correct.

45. Which statement about the logical operators is true? Mark for

Review

(1) Points

The order of operator precedence is AND, OR, and NOT.

The order of operator precedence is AND, NOT, and OR.

The order of operator precedence is NOT, OR, and AND.

The order of operator precedence is NOT, AND, and OR. (*)








Correct.

46. Which comparison condition means "Less Than or Equal To?"

Mark for Review

(1) Points

"=)"

"+<"

">="

"<=" (*)

Correct.

47. From left to right, what is the correct order of Precedence? Mark

for Review

(1) Points

Arithmetic, Concatenation, Comparison, OR (*)

NOT, AND, OR, Arithmetic

Arithmetic, NOT, Logical, Comparison








Arithmetic, NOT, Concatenation, Logical

Correct.

48. Which statement about the ORDER BY clause is true? Mark for

Review

(1) Points

You can use a column alias in the ORDER BY clause. (*)

The default sort order of the ORDER BY clause is descending.

The ORDER BY clause can only contain columns that are included in

the SELECT list.

The ORDER BY clause should immediately precede the FROM clause in

a SELECT statement

Correct.

49. Which clause would you include in a SELECT statement to sort the

rows returned by the LAST_NAME column? Mark for Review

(1) Points








ORDER BY (*)

WHERE

FROM

HAVING

Correct.

50. You need to change the default sort order of the ORDER BY clause

so that the data is displayed in reverse alphabetical order. Which

keyword should you include in the ORDER BY clause? Mark for Review

(1) Points

DESC (*)

ASC

SORT

CHANGE

Correct.








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