Question

我想为此目的创建一个查询：

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

我尝试了这个查询，但没有工作：

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：

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

Answer 2

保持简单：

DECLARE @DeleteBefore DATETIME = DATEADD(MINUTE, -240, GETDATE())

DELETE FROM [tblTempBlackList]
WHERE
  BlackListDateTime < @DeleteBefore
  AND MobileNumber = ''

dateTime字段和sql中的dateTime.Now之间的区别

2 个答案: