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
正确答案:D
答案解析:有

微信扫一扫手机做题
查询student表中的所有非空email信息,以下语句正确的是()
微信扫一扫手机做题