AconstraintinatableisdefinedwiththeINITIALLYIMMEDIATEclause.YouexecutedtheALTERT
2021-05-06
A.Itfailsifanyexistingrowviolatestheconstraint.
B.Itdoesnotvalidatetheexistingdatainthetable.
C.Itenablestheconstrainttobeenforcedattheendofeachtransaction.
D.Itpreventsinsert，update，anddeleteoperationsonthetablewhiletheconstraintisintheprocessofbeingenabled.
正确答案：参考A, D
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