final ex s2 p2

7/17/2019 final ex s2 p2

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Test: Final Exam Semester 2 Part 2

Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 11

(Answer all questions in this section)

1. You can create a view if the view subquery contains an inline view. True orFalse

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True (*)

False

$orrect

2. %hich o&tion would you use when creatin' a view to ensure that no !o&erations occur on the view

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FR$+

FR$+

%-T R+A Y (*)

%-T A!- #T-

$orrect

3. Your /ana'er has 0ust asked you to create a re&ort that illustrates the salaryran'e of all the e/&loyees at your co/&any. %hich of the followin' 12state/ents will create a view called 1AARY345 based on the e/&loyee lastna/es, de&art/ent na/es, salaries, and salary 'rades for all e/&loyees5se the +!#Y++1, +#ART!+T1, and 6738RA+1 tables. abel thecolu/ns +/&loyee, e&art/ent, 1alary, and 8rade, res&ectively.

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$R+AT+ R R+#A$+ 4-+% salary3vuA1 1++$T e.last3na/e 9+/&loyee9, d.de&art/ent3na/e 9e&art/ent9,e.salary 91alary9, 0. 'rade3level 98rade9FR! e/&loyees e, de&art/ents d, 0ob3'rades 0%+R+ e.de&art/ent3id equals d.de&art/ent3id A e.salary

7+T%++ 0.lowest3sal and 0.hi'hest3sal:$R+AT+ R R+#A$+ 4-+% salary3vuA1 1++$T e.e/&id 9+/&loyee9, d.de&art/ent3na/e 9e&art/ent9,e.salary 91alary9, 0. 'rade3level 98rade9FR! e/&loyees e, de&art/ents d, 0ob3'rades 0%+R+ e.de&art/ent3id ; d.de&art/ent3id T e.salary 7+T%++ 0.lowest3sal and 0.hi'hest3sal:$R+AT+ R R+#A$+ 4-+% salary3vuA1 1++$T e.last3na/e 9+/&loyee9, d.de&art/ent3na/e 9e&art/ent9,e.salary 91alary9, 0. 'rade3level 98rade9

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FR! e/&loyees e, de&art/ents d, 0ob3'rades 0%+R+ e.de&art/ent3id ; d.de&art/ent3id A e.salary 7+T%++ 0.lowest3sal and 0.hi'hest3sal:

(*)

$R+AT+ R R+#A$+ 4-+% salary3vuA1 (1++$T e.last3na/e 9+/&loyee9, d.de&art/ent3na/e9e&art/ent9, e.salary 91alary9, 0. 'rade3level 98rade9FR! e/&loyees e/&, de&art/ents d, 0ob 'rades 0%+R+ e.de&art/ent3id ; d.de&art/ent3id A e.salary 7+T%++ 0.lowest3sal and 0.hi'hest3sal):

$orrect

4. %hich state/ent about &erfor/in' ! o&erations on a view is true !ark for

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You can delete data in a view if the view contains the -1T-$Tkeyword. You cannot /odify data in a view if the view contains a %+R+ clause.

You cannot /odify data in a view if the view contains a 'rou& function.(*) You can /odify data in a view if the view contains a 8R5# 7Y clause.

$orrect

5. %hich of the followin' is TR5+ re'ardin' si/&le views !ark for

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1i/&le views retrieve data fro/ /any tables, so they ty&ically contain 0oins.1i/&le views contain functions or 'rou&s of data.

1i/&le views can be used to &erfor/ ! o&erations. (*)

1i/&le views are not stored in the ata ictionary.

$orrect

6. You create a view on the +!#Y++1 and +#ART!+T1 tables to dis&laysalary infor/ation &er de&art/ent.%hat will ha&&en if you issue the followin' state/ent

$R+AT+ R R+#A$+ 4-+% sal3de&tA1 1++$T 15!(e.salary) sal, d.de&art/ent3na/eFR! e/&loyees e, de&art/ents d%+R+ e.de&art/ent3id ; d.de&art/ent3id8R5# 7Y d.de&art/ent3na/e

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R+R 7Y d.de&art/ent3na/e:

A co/&le< view is created that returns the su/ of salaries &erde&art/ent, sorted by de&art/ent na/e. (*)

A si/&le view is created that returns the su/ of salaries &erde&art/ent, sorted by de&art/ent na/e.A co/&le< view is created that returns the su/ of salaries &erde&art/ent, sorted by de&art/ent id.othin', as the state/ent contains an error and will fail.

$orrect

7. %hich state/ent about &erfor/in' ! o&erations on a view is true !ark for

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You can &erfor/ ! o&erations on si/&le views. (*)

You cannot &erfor/ ! o&erations on a view that contains the %-T$+$= #T- clause. You can &erfor/ ! o&erations on a view that contains the %-T R+AY o&tion. You can &erfor/ ! o&erations on a view that contains colu/nsde>ned by e<&ressions, such as $1T ? ".

$orrect

8. %hich of the followin' describes a to&@ query !ark for

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A to&@ query returns the botto/ " records fro/ the s&eci>ed table.

A to&@ query returns the to& " records fro/ the s&eci>ed table.

A to&@ query returns a result set that is sorted accordin' to thes&eci>ed colu/n values.A to&@ query returns a li/ited result set, returnin' data based onhi'hest or lowest criteria. (*)

$orrect

9. An inline view is an unna/ed select state/ent foundB

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-n the user3views data dictionary view.

-n a s&ecial database colu/n of a users table.

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+nclosed in &arentheses within the select list of a surroundin' query.

+nclosed in &arentheses within the FR! clause of a surroundin' query.(*)

$orrect

10. You want to create a view based on the 1A+1R+# table. You &lan to 'rantaccess to this view to /e/bers of the 1ales de&art/ent. You want 1alese/&loyees to be able to u&date the 1A+1R+# table throu'h the view, whichyou &lan to na/e 1A+1R+#34-+%. %hat should not be s&eci>ed in your$R+AT+ 4-+% state/ent

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The A1 keyword

A %+R+ clause

The - keyword

A 8R5# 7Y clause (*)

$orrectSection 11


11. +valuate this $R+AT+ 4-+% state/entB

$R+AT+ 4-+% sales3viewA1 1++$T custo/er3id, re'ion, 15!(sales3a/ount)FR! sales%+R+ re'ion - ("C, DC, EC, C)8R5# 7Y re'ion, custo/er3id:

%hich state/ent is true

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You can /odify data in the 1A+1 table usin' the 1A+134-+% view.

You cannot /odify data in the 1A+1 table usin' the 1A+134-+% view.(*) You can only insert records into the 1A+1 table usin' the 1A+134-+%view. The $R+AT+ 4-+% state/ent 'enerates an error.

$orrect

12. The +!#3-1T34 view is no lon'er needed. %hich state/ent should you use

to the re/ove this view

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R# e/&3hist3v:

++T+ e/&3hist3v:

R+!4+ e/&3hist3v:

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R# 4-+% e/&3hist3v: (*)

$orrect

13. %hich o&tion would you use to /odify a view rather than dro&&in' it andrecreatin' it

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FR$+

FR$+

$R+AT+ R R+#A$+ (*)

%-T A!- #T-

$orrect

14. %hich state/ent about the $R+AT+ 4-+% state/ent is true !ark for

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A $R+AT+ 4-+% state/ent $A contain a 0oin query. (*)

A $R+AT+ 4-+% state/ent $AT contain an R+R 7Y clause.

A $R+AT+ 4-+% state/ent $AT contain a function.

A $R+AT+ 4-+% state/ent $AT contain a 8R5# 7Y clause.

$orrect

15. You need to create a view on the 1A+1 table, but the 1A+1 table has notyet been created. %hich state/ent is true

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You /ust create the 1A+1 table before creatin' the view.

7y default, the view will be created even if the 1A+1 table does note<ist. You can create the table and the view at the sa/e ti/e usin' theFR$+ o&tion.

You can use the FR$+ o&tion to create the view before the 1A+1 tablehas been created. (*)

$orrect

16. +valuate this $R+AT+ 4-+% state/entB

$R+AT+ 4-+% e/&3viewA1 1++$T 15!(salary)

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FR! e/&loyees:


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You cannot u&date data in the +!#Y++1 table usin' the +!#34-+%view. (*) You can u&date any data in the +!#Y++1 table usin' the +!#34-+%view. You can delete records fro/ the +!#Y++1 table usin' the +!#34-+%view. You can u&date only the 1AARY colu/n in the +!#Y++1 table usin'the +!#34-+% view.

$orrect

17. -n order to query a database usin' a view, which of the followin' state/entsa&&lies

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5se s&ecial 4-+% 1++$T keywords.

You can retrieve data fro/ a view as you would fro/ any table. (*)

You can never see all the rows in the table throu'h the view.

The tables you are selectin' fro/ can be e/&ty, yet the view stillreturns the ori'inal data fro/ those tables.

-ncorrect. Refer to 1ection "" esson ".

18.%hich of the followin' keywords cannot be used when creatin' a view !ark for

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A4-8

%+R+

R+R 7Y (*)

They are all valid keywords when creatin' views.

-ncorrect. Refer to 1ection "" esson ".

19. You ad/inister an racle database which contains a table na/ed+!#Y++1. uke, a database user, /ust create a re&ort that includes thena/es and addresses of all e/&loyees. You do not want to 'rant ukeaccess to the +!#Y++1 table because it contains sensitive data. %hich ofthe followin' actions should you &erfor/ >rst

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$reate a re&ort for hi/.

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$reate a view. (*)

$reate a subquery.

$reate an inde<.

$orrect

Section 12


20. %hich of the followin' best describes the function of an inde< !ark for

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An inde< can increase the &erfor/ance of 12 queries that search lar'etables. (*)An inde< can reduce the ti/e required to 'rant /ulti&le &rivile'es tousers.An inde< can run state/ent blocks when ! actions occur a'ainst atable.An inde< can &revent users fro/ viewin' certain data in a table.

$orrect

Section 12


21.%hich state/ent about an inde< is true !ark for

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An inde< can only be created on a sin'le table colu/n.

$reatin' an inde< will always i/&rove query &erfor/ance.

$reatin' an inde< reorders the data in the underlyin' table.

An inde< created on /ulti&le colu/ns is called a co/&osite orconcatenated inde<. (*)

$orrect

22. You need to deter/ine the table na/e and colu/n na/e(s) on which the1A+13-G inde< is de>ned. %hich data dictionary view would you query

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51+R3-+G+1

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51+R3TA7+1

51+R376+$T1

51+R3-3$5!1 (*)

$orrect

23. %hen creatin' an inde< on one or /ore colu/ns of a table, which of thefollowin' state/ents are true($hoose two)

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($hoose all correct answers)

You should create an inde< if the table is lar'e and /ost queries aree<&ected to retrieve less than D to &ercent of the rows. (*) You should always create an inde< on tables that are frequentlyu&dated.

You should create an inde< if one or /ore colu/ns are frequently usedto'ether in a 0oin condition. (*) You should create an inde< if the table is very s/all.

$orrect

24. 5ser !aryHs sche/a contains an +!# table. !ary has atabaseAd/inistrator &rivile'es and e<ecutes the followin' state/entB

$R+AT+ #57-$ 1YY! e/& FR /ary.e/&:

5ser 1usan now needs to 1++$T fro/ !aryHs +!# table. %hich of thefollowin' 12 state/ents can she use ($hoose two)

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$R+AT+ 1YY! /arys3e/& FR /ary(e/&):

1++$T * FR! e/&: (*)

1++$T * FR! e/&./ary:

1++$T * FR! /ary.e/&: (*)

$orrect

25. You issue this state/entB

AT+R 1+25+$+ &o3sequence -$R+!+T 7Y D:


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1equence nu/bers will be cached.

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Future sequence nu/bers 'enerated will increase by D each ti/e anu/ber is 'enerated. (*)-f the #31+25+$+ sequence does not e<ist, it will be created.

The state/ent fails if the current value of the sequence is 'reater thanthe 1TART %-T value.

$orrect

26. +valuate this $R+AT+ 1+25+$+ state/entB

$R+AT+ 1+25+$+ order3id3seq $Y$+ $A$+:


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The sequence has no /a<i/u/ value.

The sequence &reallocates values and retains the/ in /e/ory.

The sequence will continue to 'enerate values after reachin' its

/a<i/u/ value. The sequence will start with ". (*)

$orrect

Section 13


27. 33333333333333333 are s&ecial characters that have a s&ecial /eanin', suchas a wildcard character, a re&eatin' character, a non@/atchin' character, or

a ran'e of characters. You can use several of these sy/bols in &attern/atchin'.

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$li& Art

!eta characters (*)

Al&hanu/eric values

Reference checks

$orrect

28. Re'ular e<&ressions are a /ethod of describin' both si/&le and co/&le<&atterns for searchin' and /ani&ulatin'. True or False

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True (*)

False

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$orrect

29. %hich of these 12 functions used to /ani&ulate strin's is T a validre'ular e<&ression function

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R+8+G#3R+#A$+

R+8+G#3-=+

R+8+G# (*)

R+8+G#31571TR

$orrect

30. 5ser =ate wants to create inde<es on tables in her sche/a. %hat &rivile'e

/ust be 'ranted to =ate so that she can do this

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$R+AT+ -+G

$R+AT+ AY -+G

AT+R TA7+

one: users do not need e<tra &rivile'es to create inde<es on tables intheir own sche/a. (*)

$orrect

Section 13


31. You want to 'rant &rivile'es to user $A that will allow $A to u&datethe data in the +!#Y++1 table. %hich ty&e of &rivile'es will you 'rant to$A

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5ser &rivile'es

b0ect &rivile'es (*)

1yste/ &rivile'es

Ad/inistrator &rivile'es

$orrect

32. You are the database ad/inistrator. You want to create a new user 6+1with a &assword of !AR=, and allow this user to create his own tables.

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%hich of the followin' should you e<ecute Review (") #oints

$R+AT+ 51+R 0ones -+T-F-+ 7Y /ark:8RAT $R+AT+ TA7+ T 0ones:$R+AT+ 51+R 0ones -+T-F-+ 7Y /ark:8RAT $R+AT+ 1+11- T 0ones:

8RAT $R+AT+ TA7+ T 0ones:

(*)

8RAT $R+AT+ 1+11- T 0ones:8RAT $R+AT+ TA7+ T 0ones:$R+AT+ 51+R 0ones -+T-F-+ 7Y /ark:8RAT $R+AT+ 1+11- T 0ones:

-ncorrect. Refer to 1ection "E esson ".

33. 5ser AA! has successfully lo''ed on to the database in the &ast, buttoday he receives an error /essa'e statin' that (althou'h he has entered

his &assword correctly) he cannot lo' on. %hat is the /ost likely cause ofthe &roble/

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ne or /ore ob0ect &rivile'es have been R+4=+d fro/ Ada/.

AA!Hs $R+AT+ 1+11- &rivile'e has been revoked. (*)

AA!Hs $R+AT+ 51+R &rivile'e has been revoked.

AA!Hs user account has been re/oved fro/ the database.

$orrect

34. %hich of the followin' are syste/ &rivile'es($hoose two)

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$R+AT+ TA7+ (*)

5#AT+

$R+AT+ 1YY! (*)

-+G

$orrect

35. 5ser 77Hs sche/a contains an +!#Y++1 table. 77 e<ecutes thefollowin' state/entB

8RAT 1++$T e/&loyees T /ary %-T 8RAT #T-:

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%hich of the followin' state/ents can !ARY now e<ecute successfully($hoose two)


1++$T FR! bob.e/&loyees: (*)

R+4=+ 1++$T bob.e/&loyees FR! bob:

8RAT 1++$T bob.e/&loyees T #57-$: (*)

R# TA7+ bob.e/&loyees:

$orrect

36. %hich of the followin' si/&li>es the ad/inistration of &rivile'es !ark for

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An inde<

A view

A tri''er

A role (*)

$orrect

37. %hen 'rantin' an ob0ect &rivile'e, which o&tion would you include to allowthe 'rantee to 'rant the &rivile'e to another user !ark for

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%-T 8RAT #T- (*)

%-T A!- #T-

#57-$

FR$+

$orrect

38. 8rantin' an ob0ect &rivile'e %-T 8RAT #T- allows the reci&ient to'rant all ob0ect &rivile'es on the table to other users. True or False

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True

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False (*)

$orrect

39. %hich of the followin' best describes the &ur&ose of the R+F+R+$+1ob0ect &rivile'e on a table

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-t allows a userHs session to read fro/ the table but only so that forei'nkey constraints can be checked.-t allows a user to refer to the table in a 1++$T state/ent.

-t allows a user to create forei'n key constraints on the table. (*)

-t allows the user to create new tables which contain the sa/e data asthe referenced table.

-ncorrect. Refer to 1ection "E esson D.

40. You need to 'rant user 77 1++$T &rivile'es on the +!#Y++1 table. Youwant to allow 77 to 'rant this &rivile'es to other users. %hich state/entshould you use

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8RAT 1++$T e/&loyees T bob %-T 8RAT #T-: (*)

8RAT 1++$T e/&loyees T #57-$ %-T 8RAT #T-:

8RAT 1++$T e/&loyees T bob:

8RAT 1++$T e/&loyees T bob %-T A!- #T-:

$orrect

Section 14


41. %hich 12 state/ent is used to re/ove all the chan'es /ade by anunco//itted transaction

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5:

R7A$=: (*)

R7A$= T 1A4+#-T:

R+4=+ ﾅ:

$orrect

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42. 5ser 77Hs $51T!+R1 table contains DC rows. 77 inserts two /ore rowsinto the table but does not $!!-T his chan'es. 5ser 6A+ now e<ecutesB

1++$T $5T(*) FR! bob.custo/ers:

%hat result will 6A+ see

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DD

DC (*)

D

6A+ will receive an error /essa'e because she is not allowed to querythe table while 77 is u&datin' it.

$orrect

Section 15


43. The +!#Y++3- colu/n in the +!#Y++1 table corres&onds to the+!#Y++3- colu/n of the R+R1 table. The +!#Y++3- colu/n in the R+R1 table contains null values for rowsthat you need to dis&lay.%hich ty&e of 0oin should you use to dis&lay the data

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atural 0oin

1elf@0oin

uter 0oin (*)+qui0oin

$orrect

44. +valuate this 1++$T state/entB

1++$T &.&layer3id, /.last3na/e, /.>rst3na/e, t.tea/3na/eFR! &layer &+FT 5T+R 6- &layer / (&./ana'er3id ; /.&layer3id)+FT 5T+R 6- tea/ t (&.tea/3id ; t.tea/3id):

%hich 0oin is evaluated >rst

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The self@0oin of the &layer table (*)

The 0oin between the &layer table and the tea/ table on T+A!3-

The 0oin between the &layer table and the tea/ table on !AA8+R3-

The 0oin between the &layer table and the tea/ table on #AY+R3-

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$orrect

45. %hat is the /ini/u/ nu/ber of 0oin conditions required to 0oin tablesto'ether

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E

(*)

ne /ore than the nu/ber of tables

$orrect

46. %hat ha&&ens when you create a $artesian &roduct !ark for

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All rows fro/ one table are 0oined to all rows of another table (*)

The table is 0oined to itself, one colu/n to the ne<t colu/n, e<haustin'all &ossibilities The table is 0oined to another equal table

All rows that do not /atch in the %+R+ clause are dis&layed

$orrect

47. %hat is &roduced when a 0oin condition is not s&eci>ed in a /ulti&le@tablequery usin' racle &ro&rietary 6oin synta<

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A self@0oin

An outer 0oin

An equi0oin

A $artesian &roduct (*)

$orrect

48. You have been asked to create a re&ort that lists all cor&orate custo/ersand all orders that they have &laced. The custo/ers should be listedal&habetically be'innin' with the letter HAH, and their corres&ondin' ordertotals should be sorted fro/ the hi'hest a/ount to the lowest a/ount.%hich of the followin' state/ents should you issue

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1++$T c.custid, c.co/&anyna/e, o.orderdate, o. custid, o.a/ountFR! custo/ers c, orders o%+R+ c.custid ; o.custidR+R 7Y a/ount +1$, co/&anyna/e:1++$T c.custid, c.co/&anyna/e, o.orderdate, o. custid, o.a/ountFR! custo/ers c, orders o%+R+ c.custid ; o.custid

R+R 7Y co/&anyna/e, a/ount +1$:

(*)

1++$T c.custid, c.co/&anyna/e, o.orderdate, o. custid, o.a/ountFR! custo/ers c, orders o%+R+ c.custid ; o.custidR+R 7Y co/&anyna/e, a/ount:1++$T c.custid, c.co/&anyna/e, o.orderdate, o. custid, o.a/ountFR! custo/ers c, orders o%+R+ c.custid ; o.custidR+R 7Y co/&anyna/e A1$, a/ount A1$:

$orrect

49. You need to 0oin the +!#Y++1 table and the 1$+5+1 table, but thetwo tables do not have any corres&ondin' colu/ns. %hich ty&e of 0oin willyou create

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An equi0oin

-t is not &ossible to 0oin these two tables.

A non@equi0oin (*)

A full outer 0oin

$orrect

Section 16


50. 5nit testin' is done &rior to a database 'oin' into &roduction to ensure arando/ nu/ber of business require/ents functions &ro&erly. True or False

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True

False (*)

$orrect

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