sql - sql中dateTime字段和dateTime.Now之间的区别

Question

我想为此目的创建一个查询:

从我的表 [tblTempBlackList] 中删除，其中 dateTime 字段与 dateTime.Now 之间的差异超过 240 分钟。

我尝试了这个查询，但没有成功:

DELETE FROM [tblTempBlackList] 
WHERE (SELECT DATEDIFF(MINUTE, (SELECT [tblTempBlackList].BlackListDateTime 
                                FROM [tblTempBlackList] 
                                WHERE MobileNumber = '') , GETDATE()
                      )
      ) > '240'`

Answer 1

试试这个:

DELETE FROM tblTempBlackList
WHERE 
DATEDIFF(MINUTE, (SELECT [tblTempBlackList].BlackListDateTime FROM [tblTempBlackList] WHERE MobileNumber = ''), GETDATE()) > 240

或者，更简洁地说:

DELETE FROM tblTempBlackList
WHERE 
DATEDIFF(MINUTE, BlackListDateTime, GetDate()) > 240
AND MobileNumber = ''