共找到 66 与primary 相关的结果，耗时0 ms
A．FOREIGN KEYB．PRIMARY KEYC．FOREIGN KEY (Sno) REFERENCES SD．FOREIGN KEY (Pno) PEFERENCES P
定义在一个关系上的约束不可以有(40)。A．域约束B．DEFAULT(缺省值约束)C．PRIMARY KEY(主码约束)D．断言
A．Foreign KeyB．Primary KeyC．Foreign Key(Sno)References SD．Foreign Key(Pno)PEFERENCES P
A．PRIMARY KEYB．FOREION KEYC．FOREIGN KEY (ORDERID) REFERENCES ORDERSD．FOREIGN KEY (BID) REFERENCES BOOKS
A．ForeignKeyB．Primary KeyC．Foreign Key(Sno)References SD．Foreign Key(Pno)PEFERENCES P
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
A．PRIMARY KEYB．FOREIGN KEYC．FOREIGN KEY (ORDERID) REFERENCES ORDERSD．FOREIGN KEY (BID) REFERENCES BOOKS
如何访问以下菜单?Please choose an option from below：1．Run primary image(version 4.1.192.17)(active)2．Run backup image(version 4.2.99.0)3．Manually update imag
SQL语言中实现候选码约束的语句是(41)。A．用Candidate Key 指定B．用Primary Key 指定C．用UNIQUE NOT NULL 约束指定D．用UNIQUE约束指定
A.INSERT INTO CustomerB.SET IDENTITY_INSERT Customer ONC.VALUES（3，’garden shovel’）D.（id，Customer）
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