共找到 9 与KeyD 相关的结果,耗时2 ms
A.Primary Key NOT NULLB.Primary KeyC.Foreign KeyD.Candidate Key
允许取空值但不允许出现重复值的约束是______。A.NULLB.UNIQUEC.PRIMARY KEYD.FOREIGN KEY
允许取空值但不允许出现重复值的约束是(14)。A.NULLB.UNIQUEC.Primary KeyD.Foreign Key
允许取空值但不允许出现重复值的约束是(46)。A.NULLB.UNIQUEC.PRIMARY KEYD.FOREIGN KEY
A.Primary Key NOTNULLB.Primary KeyC.Foreign KeyD.Candidate Key
在SQL语言中,______子句能够实现关系参照性规则。A.PRIMARY KEYB.NO TNULLC.FOREIGN KEYD.FOREIGN KEY...REFERENCES...
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