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ViewtheExhibitandexaminethestructureoftheEMPtable.YouexecutedthefollowingcommandtoaddaprimarykeytotheEMPtable：ALTERTABLEempADDCONSTRAINTemp_id_pkPRIMARYKEY（emp_id）USINGINDEXemp_id_idx；Whichstatementistrueregardingtheeffectofthecommand？（）
A.ThePRIMARYKEYiscreatedalongwithanewindex.
B.ThePRIMARYKEYiscreatedanditwoulduseanexistinguniqueindex.
C.ThePRIMARYKEYwouldbecreatedinadisabledstatebecauseitisusinganexistingindex.
D.ThestatementproducesanerrorbecausetheUSINGclauseispermittedonlyintheCREATETABLEcommand.
参考答案
更多 “ ViewtheExhibitandexaminethestructureoftheEMPtable.YouexecutedthefollowingcommandtoaddaprimarykeytotheEMPtable：ALTERTABLEempADDCONSTRAINTemp_id_pkPRIMARYKEY（emp_id）USINGINDEXemp_id_idx；Whichstatementistrueregardingtheeffectofthecommand？（）A.ThePRIMARYKEYiscreatedalongwithanewindex.B.ThePRIMARYKEYiscreatedanditwoulduseanexistinguniqueindex.C.ThePRIMARYKEYwouldbecreatedinadisabledstatebecauseitisusinganexistingindex.D.ThestatementproducesanerrorbecausetheUSINGclauseispermittedonlyintheCREATETABLEcommand. ” 相关考题
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