raspunsuri oracle midterm exam

7/27/2019 Raspunsuri Oracle midterm exam

1/21

Section 12

1. Entity integrity refers to Mark for Review(1) Points

Tables always containing text data

Tables always containing n!eric data

"ol!ns #aving Pri!ary $eys% &oreign $eys% 'nie $eys and "#eck constraints

defined in t#e database.

Tables #aving Pri!ary $eys% &oreign $eys% 'nie $eys and "#eck constraintsdefined in t#e database. ()

*ncorrect. Refer to Section 12

2. T#e ex+lanation below is a 'ser ,efined integrity rle and !st t#erefore be

!anally coded% t#e ,atabase cannot enforce t#is rle ato!atically-

+ri!ary key !st be nie% and no +art of t#e +ri!ary key can be nll. Tre or &alse/Mark for Review

(1) Points

Tre

&alse ()

"orrect

0. T#e ex+lanation below is a col!n integrity constraint-

col!n !st contain only vales consistent wit# t#e defined data for!at of t#e

col!n. Tre or &alse/Mark for Review

(1) Points

Tre ()

&alse

"orrect


2/21

. T#e text below is an exa!+le of w#at constraint ty+e-

T#e vale in t#e !anagerid col!n of t#e EMP345EES table !st !atc# a vale int#e e!+loyeeid col!n in t#e EMP345EES table.

Mark for Review

(1) Points

Entity integrity

'ser6defined integrity

"ol!n integrity

Referential integrity ()

"orrect

7. n 8rc *!+le!entation8 can be done 9st like any ot#er Relations#i+ 6 yo si!+ly

add t#e reired &oreign $eys. Tre or &alse/ Mark for Review

(1) Points

Tre

&alse ()

"orrect

:. ;#ic# of t#e following are reasons w#y yo s#old consider sing a Sbty+e*!+le!entation/ Mark for Review

(1) Points

T#e reslting table will reside in a single database and be sed by 9st 4


3/21

>. ;#at do yo create w#en yo transfor! a !any to !any relations#i+ fro! yor ERdiagra! into a +#ysical design/ Mark for Review

(1) Points

'nie key constraints

*ntersection entity

*ntersection table ()

Two tables wit# &oreign key constraints between t#e!

"orrect

?. 4ne6to64ne relations#i+s are transfor!ed into "#eck "onstraints in t#e tablescreated at eit#er end of t#at relations#i+. Tre or &alse/ Mark for Review

(1) Points

Tre

&alse ()

"orrect

@. ;#y wold t#is table na!e


4/21

1B. T#e transfor!ation fro! an ER diagra! to a +#ysical design involves c#anging

ter!inology. Secondary 'nie *dentifiers beco!e Mark for Review

(1) Points

"ol!ns

Tables

'nie "onstraints ()

Pri!ary $ey "onstraints

"orrect

Section 12

11. *n a +#ysical data !odel% a relations#i+ is re+resented as a co!bination of- ("#oose

Two) Mark for Review(1) Points

("#oose all correct answers)

"ol!n

Pri!ary $ey or 'nie $ey ()

"#eck "onstraint or 'nie $ey

&oreign $ey ()

*ncorrect. Refer to Section 12

Section 10

12. ;#at co!!and can be sed to create a new row in a table in t#e database/ Mark

for Review

(1) Points

"RETE


5/21

,,

*


6/21

(1) Points

;#en all non6'*, attribtes are de+endent +on t#e entire '*,. ()

;#en no attritibtes are !tally inde+endant and flly inde+endent on t#e +ri!ary

key.

;#en no attritibtes are !tally inde+endent and all are flly de+endent on t#e

+ri!ary key.

. ;#ic# SG3 state!ent will retrn an error/ Mark for Review(1) Points

SE3 &R skyI ()

select star fro! skyI

SE3E"T star &R4M skyI


7/21

SE3E"T &R4M skyI

*ncorrect. See Section 1:

1?. 5o want to create a list of all alb!s t#at #ave been +rodced by t#e co!+any.

T#e list s#old inclde t#e title of t#e alb!% t#e artists na!e% and t#e date t#e alb!was released. T#e 3='MS table incldes t#e following col!ns-

3=T*T3E DR"CR2(17B)


8/21

To insert data

To view data ()

To dis+lay t#e table strctre

To delete data

"orrect.

2B. ;#en listing col!ns in t#e SE3E"T list% w#at s#old yo se to se+arate t#e

col!ns/ Mark for Review

(1) Points

"o!!as ()

Se!icolons

,as#es

'nderscores

*ncorrect. See Section 1:

Section 1:

21. T#e EMP345EES table contains t#ese col!ns-

S3R5


9/21

2.

SE3E"T (salary A bons ) A co!!ission+ct (salary 6 bons) inco!e

&R4M e!+loyeesI

;#at will be t#e reslt/

Mark for Review(1) Points

State!ent 1 will retrn a #ig#er vale t#an state!ent 2.

State!ent 2 will retrn a #ig#er vale t#an state!ent 1. ()

State!ent 1 will dis+lay a different col!n #eading.

4ne of t#e state!ents will

20. Evalate t#is SE3E"T state!ent-

SE3E"T lastna!e% firstna!e% salary

&R4M e!+loyeesI

Cow will t#e #eading for t#e S3R5 col!n a++ear in t#e dis+lay by defalt in 4racle

++lication Ex+ress/

Mark for Review


10/21

(1) Points

T#e #eading will dis+lay wit# t#e first c#aracter ca+italiFed and centered.

T#e #eading will dis+lay wit# t#e first c#aracter ca+italiFed and left 9stified.

T#e #eading will dis+lay as ++ercase and centered. ()

T#e #eading will dis+lay as ++ercase and left 9stified.

*ncorrect. See Section 1>.

2. 5o need to dis+lay all t#e e!+loyees w#ose last na!e starts wit# t#e letters S! .

;#ic# ;CERE clase s#old yo se/ Mark for Review

(1) Points

;CERE lastna!e 3*$E S!J ()

;CERE lastna!e 3*$E JS!

;CERE lastna!e 3*$E S!

;CERE lastna!e 3*$E S!

*ncorrect. See Section 1>

27. 5o want to deter!ine t#e orders t#at #ave been +laced by csto!ers w#o reside in

"#icago. 5o write t#is +artial SE3E"T state!ent-SE3E"T orderid% orderdate% total

&R4M ordersI

;#at s#old yo inclde in yor SE3E"T state!ent to ac#ieve t#e desired reslts/Mark for Review

(1) Points


11/21

"orrect.

2:. ;#ic# SE3E"T state!ent will dis+lay bot# nie and non6nie co!binationsof t#e M


12/21

*ncorrect. See Section 1>.

2?. T#e ST',E


13/21

&*RST.

Section 1>

01. T#e "oncatenation 4+erator does w#ic# of t#e following/ Mark for Review

(1) Points

3inks rows of data toget#er inside t#e database.

3inks two or !ore col!ns or literals to for! a single ot+t col!n ()

*s re+resented by t#e asterisk () sy!bol

Se+arates col!ns.

*ncorrect. See Section 1>

02. 5o need to dis+lay only nie co!binations of t#e 3ST


14/21

4

0. 5o need to dis+lay e!+loyees w#ose salary is in t#e range of 0BBBB and 7BBBB.;#ic# co!+arison o+erator s#old yo se/ Mark for Review

(1) Points

*. T#e EMP345EES table contains t#ese col!ns-

EMP345EE*,


16/21

2.

SE3E"T de+art!entid ,EPT% lastna!e% firstna!e&R4M e!+loyees

4R,ER =5 ,EPTI

Cow will t#e reslts differ/

Mark for Review

(1) Points

4ne of t#e state!ents will retrn a syntax error.

4ne of t#e state!ents will eli!inate all d+licate ,EPRTME


17/21

&R4M +layers

;CERE salary =ET;EE< 27BBB


18/21

T#e order of o+erator +recedence is


19/21

0RDER / (&

W2ERE

#R0M

2A5'N3

.orrect

45.Eval"ate this %E$E.T state+ent6

%E$E.T last4na+e7 first4na+e7 depart+ent4id7 +anager4id#R0M e+plo-ees8

/o" need to sort data *- +anager id val"es and thenalpha*eticall- *- e+plo-ee last na+e and first na+e val"esWhich 0RDER / cla"se co"ld -o" "se?

Mark for Review(1 !oints

0RDER / depart+ent4id7 last4na+e

0RDER / +anager4id7 last4na+e7 first4na+e (&

0RDER / last4na+e7 first4na+e7 +anager4id

0RDER / +anager4id7 first4na+e7 last4na+e

.orrect


%E$E.T R0M e+plo-eesW2ERE salar- 9 :;;;;

AND depart+ent4id < 1;0R e+ail '% N0T NU$$8Which state+ent is tr"e?

Mark for Review

(1 !oints

The 0R condition will *e eval"ated *efore the ANDconditionThe AND condition will *e eval"ated *efore the 0Rcondition (&The 0R and AND conditions have the sa+e precedenceand will *e eval"ated fro+ left to rightThe 0R and AND conditions have the sa+e precedenceand will *e eval"ated fro+ right to left

.orrect


%E$E.T R0M e+plo-eesW2ERE depart+ent4id < :=0R depart+ent4id < =>



20/21

0R depart+ent4id < @8

Which operator is the e"ivalent of the 0R conditions "sed inthis %E$E.T state+ent?

'N (&

AND

$',E

ETWEEN AND

.orrect

48./o" atte+pt to "er- the data*ase with this %B$ state+ent6

%E$E.T prod"ct4id C!rod"ct N"+*erC7 categor-4idC.ategor-C7 price C!riceC

#R0M prod"ctsW2ERE C.ategor-C < >>@;0RDER / C!rod"ct N"+*erC8

This state+ent fails when eec"ted Which cla"se contains as-nta error?

Mark for Review

(1 !oints

%E$E.T prod"ct4id C!rod"ct N"+*erC7 categor-4idC.ategor-C7 price CpriceC0RDER / C!rod"ct N"+*erC8

#R0M prod"cts

W2ERE C.ategor-C < >>@; (&

.orrect


%E$E.T e+plo-ee4id7 last4na+e7 first4na+e7 salar- /earl-%alar-#R0M e+plo-eesW2ERE salar- '% N0T NU$$0RDER / last4na+e7 :8

Which cla"se contains an error?

Mark for Review

(1 !oints

%E$E.T e+plo-ee4id7 last4na+e7 first4na+e7 salar-/earl- %alar- (R0M e+plo-ees

W2ERE salar- '% N0T NU$$

0RDER / last4na+e7 :8

.orrect


21/21

50./o" need to create a report to displa- all e+plo-ees thatwere hired on or after Fan"ar- 17 1GG The data sho"lddispla- in this for+at6

E!+loyee Start ,ate and Salary

1?0> 6 S!it# 1B6M56@2 7BBB

Which %E$E.T state+ent co"ld -o" "se?


%E$E.T e+plo-ee4id HH I HH last4na+e CE+plo-eeC7hire4date HH J HH salar- C%tart Date and %alar-C#R0M e+plo-eesW2ERE hire4date K< ;1IFANIG8%E$E.T e+plo-ee4id HH HH last4na+e CE+plo-eeC7hire4date HH HH salar- C%tart Date and %alar-C#R0M e+plo-eesW2ERE hire4date K< ;1IFANIG8%E$E.T e+plo-ee4id HHCI CHH last4na+e CE+plo-eeC7hire4date HHC J CHH salar- C%tart Date and %alar-C

#R0M e+plo-eesW2ERE hire4date K< ;1IFANIG8%E$E.T e+plo-ee4id HH I HH last4na+e E+plo-ee7hire4date HH J HH salar- %tart Date and %alar-#R0M e+plo-eesW2ERE hire4date K< ;1IFANIG8%E$E.T e+plo-ee4id HH I HH last4na+e CE+plo-eeC7hire4date HH J HH salar- C%tart Date and %alar-C#R0M e+plo-eesW2ERE hire4date K< ;1IFANIG8

(&

.orrect

raspunsuri oracle midterm exam

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