Youareplanningtoimportcustomerdatafromthe&
2021-05-05
YouareplanningtoimportcustomerdatafromtheCustomertableandtheCountrytableinyourSQLServer2000databaseintoaSQLServer2005database.Youwanttoensurethatduringtheimportprocess，eachvalueintheCountryCodecolumnoftheCustomertablehasacorrespondingrecordintheCountryCodecolumnintheCountrytableoftheSQLServer2005database.Youdefineaforeignkeybetweenthesetwotables.Thus，referentialintegritywillguaranteethattheimportroutinefailsifthereareanyrecordswhereaCountryCodevaluedoesnotexistintheCountrytablebutdoesexistintheCustomertable.YouneedtoensurethattheimportprocessdoesnotfailifrecordsareencounteredthatdonotexistintheCountrytable.
Whatshouldyoudo？（）
正确答案：参考C
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