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 !=nullB、Select email from student where email not is nullC、Select email from student where email <> nullD、Select email from student where email is not null
题目
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 email not is null
- C、Select email from student where email <> null
- D、Select email from student where email is not null
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参考答案和解析
正确答案:D