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Database Theory Final Q And A

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DATABASE THEORY FINAL Q AND A

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DATABASE THEORY FINAL Q AND A

Whichgjtermgjcangjbegjdescribedgjasgjthegjduplicationgjofgjdatagjandgjstoringgjitgjingjmultiplegjl
ocations?gj-gjanswer--redundancy

Whichgjofgjthegjfollowinggjisgjcalledgjagjfieldgjorgjcolumngjingjmanygjdatabasegjsystems?gj-
gjanswer--attribute



Whichgjdatabasegjtermgjisgjagjperson,gjplace,gjobject,gjevent,gjorgjideagjforgjwhichgjyougjwant
gjtogjstoregjandgjprocessgjdata?gj-gjanswer--entity



Ingjdatabasegjterms,gjwhatgjisgjthegjanalogygjtogjangjordinarygjpapergjfilegjyougjmightgjkeepgji
ngjagjfilegjcabinetgjorgjangjaccountinggjledger?gj-gjanswer--datagjfile

Whichgjaspectgjofgjangjentitygjbecomesgjthegjcolumnsgjingjthegjdatabasegjtable?gj-gjanswer--
attributes

Howgjaregjmultiplegjentitiesgjstoredgjingjagjdatabase?gj-gjanswer--
eachgjentitygjisgjstoredgjasgjagjtable

Whatgjtoolgjcangjyougjusegjtogjvisuallygjrepresentgjandgjanalyzegjagjdatabase?gj-gjanswer--
entity-relationshipgjdiagram

Whichgjofgjthegjfollowinggjaregjscreengjobjectsgjusedgjtogjmaintain,gjview,gjandgjprintgjdatagjfr
omgjagjdatabase?gj-gjanswer--Forms

Whichgjadvantagegjofgjdatabasegjprocessinggjmakesgjitgjeasiergjtogjmakegjagjchangegjingjth
egjdatabasegjstructure?gj-gjanswer--datagjindependence

Whichgjcommandgjcreatesgjagjtablegjcontaininggjallgjrowsgjthatgjaregjingjeithergjorgjbothgjofgjt
wogjtables?gj-gjanswer--UNION

WhatgjtypegjofgjfunctionsgjaregjCount,gjSum,gjAvg,gjMax,gjandgjMin?gj-gjanswer--aggregate

Whatgjuniquelygjidentifiesgjagjrowgjingjagjtable?gj-gjanswer--primarygjkey

Whichgjtermgjisgjanothergjwordgjforgjagjrowgjingjagjtable?gj-gjanswer--tuple

WhichgjofgjthegjfollowinggjisgjNOTgjtruegjaboutgjagjrelationgjingjagjtwo-dimensionalgjtable?gj-
gjanswer--Twogjorgjmoregjcolumnsgjcangjsharegjthegjsamegjname.



Whichgjofgjthegjfollowinggjisgjthegjcolumngjorgjcollectiongjofgjcolumnsgjthatgjuniquelygjidentifi
esgjagjgivengjrowgjingjthatgjtable?gj-gjanswer--primarygjkey

, Basedgjongjthegjtablegjbelow,gjwhichgjcommandgjlistsgjallgjinformationgjfromgjthegjtablegjcon
cerninggjthegjcustomergjwithgjCustomerNumgj260?
gjCustomergj(CustomerNum,gjCustomerName,gjStreet,gjCity,gjState,gjPostalCode)gj-

gjanswer--SELECTgjCustomergjWHEREgjCustomerNum=260gjGIVINGgjAnswer



Basedgjongjthegjtablesgjbelow,gjwhichgjcommandgjcreatesgjagjnewgjtablegjnamedgjCustSale
sgjthatgjcombinesgjthegjCustomergjandgjSalesPersongjtablesgjbasedgjongjSalesPersonNu
m?
gjCustomergj(CustomerNum,gjCustomerName,gjStreet,gjCity,gjState,gjPostalCode,gjSales

PersonNum)gjSalesPersongj(SalesPersonNum,gjLastName,gjFirstName)gj-gjanswer--
JOINgjCustomergjSalesPersongjWHEREgjCustomer.SalesPersonNum=SalesPerson.S
alesPersonNumgjGIVINGgjCustSales

IngjversionsgjofgjSQLgjothergjthangjAccess,gjwhichgjcharactergjisgjusedgjasgjagjwildcardgjtogjre
presentgjanygjcollectiongjofgjcharacters?gj-gjanswer--percentgjsigngj(%)

Whichgjfunctiongjcalculatesgjthegjnumbergjofgjentriesgjingjagjtable?gj-gjanswer--COUNT

Whatgjcommandgjdogjyougjusegjtogjmakegjchangesgjtogjexistinggjdatagjingjagjtable?gj-
gjanswer--UPDATE



Whatgjcommandgjdogjyougjusegjtogjaddgjnewgjdatagjtogjagjtable?gj-gjanswer--INSERT

Whatgjclausegjdogjyougjusegjingjagjquerygjtogjsavegjthegjresultsgjofgjthegjquerygjasgjagjtable?gj-
gjanswer--INTO



Whilegjnotgjalwaysgjrequired,gjhowgjshouldgjyougjendgjangjSQLgjcommand?gj-gjanswer--
withgjagjsemicolongj(;)

WhichgjpartgjofgjthegjSQLgjquerygjspecifiesgjthegjtablegjorgjtablesgjthatgjcontaingjthegjdatagjyo
ugjwishgjtogjdisplaygjingjthegjquerygjresults?gj-gjanswer--FROMgjclause

WhengjusedgjaftergjthegjwordgjSELECT,gjwhichgjsymbolgjindicatesgjthatgjyougjwantgjtogjinclu
degjallgjfieldsgjingjthegjquerygjresultsgjingjthegjordergjingjwhichgjyougjdescribedgjthemgjtogjthegj
DBMSgjwhengjyougjcreatedgjthegjtable?gj-gjanswer--*

WhichgjoperatorgjdogjyougjusegjingjthegjWHEREgjclausegjwhengjyougjwantgjtogjincludegjagjwil
dcard?gj-gjanswer--LIKE

WhichgjquerygjwillgjreturngjthegjnumbergjofgjrowsgjwheregjthegjStategjfieldgjisgj'AZ'gjfromgjthegjt
ablegjCustomers?gj-gjanswer--
SELECTgjCOUNT(*)gjFROMgjCustomersgjWHEREgjState='AZ';

Howgjmanygjlinesgjofgjoutputgjaregjproducedgjwhengjrowsgjaregjgrouped?gj-gjanswer--
onegjlinegjforgjeachgjgroup

WhichgjquerygjwillgjreturngjthegjnumbergjofgjrowsgjwheregjthegjStategjfieldgjisgj'AZ'gjfromgjthegjt
ablegjCustomersgjandgjprovidegjagjtotalgjofgjthegjPaymentgjfield?gj-gjanswer--
SELECTgjCOUNT(*),gjSUM(Payment)gjFROMgjCustomersgjWHEREgjState='AZ';

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