98 364 Test Bank Lesson03

8/10/2019 98 364 Test Bank Lesson03

1/6

Lesson 3: Manipulating Data

Multiple Choice

1. What command do you use to perform a query in SQL?

a USE! SELECT

c QUERY

d CHOSE

"ns#er: !Difficulty: !Section $eference: %sing Queries to Select Data&'planation: (he SQL command for retrie)ing any data from a data!ase is SELECT. Much li*e

any other SQL command+ it #ill read similar to an &nglish statement.

,. What #ildcard character retrie)es all records #ith the SELECTcommand?a *

! %

c $

d ?

"ns#er: aDifficulty: &asySection $eference: %sing Queries to Select Data&'planation: -f you #ant to choose all column names from #ithin a ta!le+ use an asteris* * in

place of #here the column name #ould !e identified.

3. What #ould you use to com!ine t#o parameters in a query in SQL?a PLUS

! BOTH

c COMBINE

d AND

"ns#er: dDifficulty: MediumSection $eference: /om!ining /onditions&'planation: -f you need more from a query than simply one set of parameters+ you can use an

ANDclause to com!ine se)eral conditions in one query statement to satisfy your requirements.0or e'ample+ if you #ant to find the employees #ho #or* in the Shipping department !ut also#ant to find out #hich of those employees are female+ you #ould use this query:

SELECT first_na!" #ast_na!ROM !#&'!!s(HERE )!art!nt +s,iin-+ AND -!n)!r ++


2/6

. What clause #ould you use #ith the SELECTcommand that #ould pull records !ased on a

range?a COMBO

! BET(EEN

c OR

d COMBINE

"ns#er: !Difficulty: &asySection $eference: %sing the 2&(W&& /lause&'planation: (o help resol)e the a#*#ardness in using the ANDclause in a query statement+

replace it #ith a BET(EENclause instead. (his allo#s you to specify the range to !e used in a

4!et#een ' and y5 query format for a much cleaner statement.

6. What *ey#ord used #ith the SELECTstatement is used to notoutput specified records?

a OR

! DISALLO(c DISRE.ARD

d NOT

"ns#er: dDifficulty: &asySection $eference: %sing the 7( /lause&'planation: -n some instances+ you might find it simpler to #rite your query to search data interms of #hat you don8t #ant in your output. (ransact9SQL pro)ides you #ith a NOT*ey#ord for

use in such situations.

. What #ould you use to com!ine columns from t#o different ta!les?a AND

! BET(EEN

c /OIN

d COMBINE

"ns#er: cDifficulty: MediumSection $eference: %sing the %-7 /lause&'planation: (he ;7- clause allo#s you to com!ine related data from multiple ta!le sources.;7- statements are similar in application that !oth &


3/6

d E0CLUDE

"ns#er: aDifficulty: &asySection $eference: %sing the &


4/6

UPDATE 1ta2#!_na!3SET 1attri24t!3 15a#4!3(HERE 16&n)iti&ns3

11. What statement is used to delete one or more ro#s in a ta!le?a DELETE

! REMO7Ec TRUNCATE

d CHAN.E

"ns#er: aDifficulty: &asySection $eference: Deleting Data&'planation: (he DELETEstatement is used to perform the e'act function it states: remo)e ro#s

from a ta!le or a )ie#. ou can use DELETEin se)eral #ays+ depending on the amount of data

you need to ha)e remo)ed. (he simplest method is to identify and delete indi)idual ro#s from#ithin the data!ase using the DELETEcommand synta'.

1,. What statement is used to delete a ta!le from a data!ase?a DELETE

! DROP

c REMO7E

d TRUNCATE

"ns#er: !Difficulty: MediumSection $eference: Deleting a (a!le #ith D$7= ("2L&&'planation: Suppose that you #ant to delete an entire ta!le !ecause it8s o!solete. (he remo)al

of an entire ta!le loo*s li*e this:

DROP TABLE 1ta2#!_na!3

13. @o# can you pre)ent the accidental loss of an entire ta!le?a %se the DELETE TRANScommand.

! %se the LOOPBAC8command.

c %se the SAEDELETEcommand.

d %se referential integrity.

"ns#er: d

Difficulty: @ardSection $eference: %sing $eferential -ntegrity&'planation: " failo)er measure that you can ta*e regarding data!ase ta!les is using referentialintegrity practice methods. 7ne of the most common mista*es of data!ase manipulating is theaccidental loss of entire ta!les. (he !est #ay to a)oid this type of situation in the first place is toensure that your data!ase is using referential integrity. $eferential integrity does not allo#deletion of ta!les+ unless they are actually at the end of the relationship.


5/6

1. What do you perform #hen you #ant to recall specific records from a data!ase?a recall! )irtual e'tractionc reachd query

"ns#er: dDifficulty: &asySection $eference: %sing Queries to Select Data&'planation: ou use the SELECTstatement to retrie)e or e'tract data from one ta!le+ retrie)e or

e'tract data !y using Eoins+ and com!ine results !y using UNIONand INTERSECT. When you

retrie)e or e'tract data from a ta!le+ you are performing a query.

16. What command #ould you use to delete a ta!le #hile lea)ing the ta!le structure in place forfuture use?a DELETE TABLE

! TRUNCATE TABLEc REMO7E TABLE

d STOP TABLE

"ns#er: !Difficulty: MediumSection $eference: (runcating a (a!le #ith ($%/"(& ("2L&&'planation: (he TRUNCATE TABLEstatement remo)es only the data from #ithin the ta!le !ut

lea)es the ta!le structure in place for future use.

Short Answer

1. What statement #ould you use to pull 0irstFame+ LastFame+ and -DFum!er from the%sers ta!le?

"ns#er: SELECT irst_Na!" Last_Na!" ID_N42!rROM Us!rs

Difficulty: @ardSection $eference: %sing Queries to Select Data&'planation: (he SQL command for retrie)ing any data from a data!ase is SELECT. Much li*e

any other SQL command+ it #ill read similar to an &nglish statement. /omposing a SELECT

statement is similar to filling in the !lan*s+ such as the follo#ing:

SELECT i)" na! 996nsROM s's&2:!6ts 99 ta2#!s(HERE t'! ;:&n!s; 996&n)iti&ns '&4


6/6

1>. What statement #ould you use to pull all records in #hich the State is /" from the %sersta!le?

"ns#er: SELECT *ROM Us!rs(HERE Stat! +CA+

Difficulty: @ardSection $eference: %sing Queries to Select Data&'planation: Suppose that you #ant to pro)ide your !oss #ith a list of employees #hose salaryrange is a!o)e G6CH. ou are interested only in retrie)ing those employees #ho fit your !oss8scriteria. @ere8s ho# you #ould do that in SQL:

SELECT first_na!" #ast_na!" sa#ar'ROM !#&'!!s(HERE sa#ar' 3 =>">>>

1. What statement #ould you use to pull 0irstFame and LastFame from the %sers ta!le in

#hich Iender is 0 and State is /"?

"ns#er: SELECT irst_Na!" Last_Na!ROM Us!rs(HERE .!n)!r ++ AND Stat! +CA+

Difficulty: @ardSection $eference: /om!ining /onditions&'planation: ou can com!ine se)eral conditions in one query statement to satisfy yourrequirements.

1A. What statement #ould you use to list the 0irstFame and LastFame from the %sers ta!le#hich Department is not -(?

"ns#er: SELECT irst_Na!" Last_Na!ROM Us!rs(HERE NOT D!art!nt +IT+

Difficulty: @ardSection $eference: %sing the 7( /lause&'planation: -n some instances+ it is simpler to #rite your query to search data in terms of #hatyou don8t #ant in your output. (ransact9SQL pro)ides you #ith a NOT*ey#ord for use in such

situations.

,C. What statement #ould you use to delete the &quipment ta!le?

"ns#er: DROP TABLE E4i!nt

Difficulty: @ardSection $eference: Deleting a (a!le #ith DROP TABLE

&'planation: o#+ may!e you Eust #ant to delete the entire ta!le? (he remo)al of an entire ta!leloo*s li*e this:

DROP TABLE 1ta2#!_na!3

Documents

98 364 Test Bank Lesson03