SQL中,下列涉及空值的操作,不正确的是
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
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正确答案: A 答案分析:无
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相关的试题
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)
A.AGE=NULL
B.AGE IS NOT NULL
C.AGE IS NULL
D.NOT(AGE IS NULL)