查询student表中的所有非空email信息,以下语句正确的是()

A . Select email from student where email!=null B . Select email from student where emailnotisnull C . Select email from student where email<>null D . Select email from student where emailisnotnull

时间:2022-10-18 05:09:19 所属题库:院感知识题库

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