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单项选择题有一个名为Customers的表,需要确保表中的客户数据符合下面的条件:除非客户身份(Verified)已经过验证,否则信用限额(CreditLimt)必须为零。信用限额必须小于等于10000。应使用()约束。

A、CHECK((CreditLimt=0 AND Verified=0)OR(CreditLimt BETWEEN 1 AND 10000 AND Verified=1)

B、CHECK(CreditLimt BETWEEN 1 AND 10000)

C、CHECK(Verified=1 AND CreditLimt BETWEEN1 AND 10000)

D、CHECK(CreditLimt=0 ANDV erified=0)AND(CreditLimt BETWEEN 1 AND 10000 AND Verified=1)

  • A
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