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(请给出正确答案)
在SQL中,下列涉及空值的操作,不正确的是()。
A.AGE IS NULL
B.AGE IS NOT NULL
C.AGE = NULL
D.NOT (AGE IS NULL)
参考答案和解析
C 解析:与空值(NULL) 有关的表达式中不能使用等号“=”。注意审题,本题是“涉及”空值的操作。
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