题目内容
(请给出正确答案)
[主观题]
A.NOT NULLB.UNIQUEC.PRIMARY KEY(Sno)D.PRIMARY KEY(Sname)
A.NOT NULL
B.UNIQUE
C.PRIMARY KEY(Sno)
D.PRIMARY KEY(Sname)
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A.NOT NULL
B.UNIQUE
C.PRIMARY KEY(Sno)
D.PRIMARY KEY(Sname)
A.Not at all.
B.It's my pleasure.
C.No problem.
D.Thank you very much.
What we care is ().
A.not price but quality
B.price but not quality
C.but quality not price
D.quality nor price
A.NOT NULL
B.NOT NULL UNIQUE
C.PRIMARY KEY(Sno)
D.PRIMARY KEY(Sname)
逻辑运算符的运算优先级从高到低是______。
A.NOT→OR→AND
B.NOT→AND→OR
C.AND→NOT→OR
D.OR→NOT→AND
在SQL语言中,可用于测试列值非空的短语是
A.NOT UNIQUE
B.NOT EXISTS
C.IS NOT EMPTY
D.IS NOT NULL
动态变量的撤消必须使用标准过程()
A.NOT NEW(P)
B.DELETE(P)
C.DISPOSE(P)
D.ERASE(P)
A.NOT,AND,OR,()
B.(),NOT,AND,OR
C.(),OR,NOT,AND
D.(),AND,NOT,OR