php - PHP mySql - 更改语句以不删除某些值？

Question

DELETE FROM banned_users WHERE datetime < (NOW() - INTERVAL $ban MINUTE)

我目前正在使用上述内容仅删除禁令已解除的帐户，但是我可以将语句更改为不删除 'ban_length' != "INF" 的项目

score 1 · Accepted Answer

假设您没有其他要求，那么这应该可以解决问题：

DELETE FROM banned_users WHERE ban_length != 'INF' && datetime < (NOW() - INTERVAL $ban MINUTE)

score 0 · Accepted Answer

0

DELETE FROM banned_users WHERE datetime < (NOW() - INTERVAL $ban MINUTE) && ban_length != 'INF'

于 2013-08-18T23:41:18.033 回答

score 0 · Accepted Answer

不删除项目在哪里ban_length != 'INF'？所以只在什么时候删除项目ban_length = 'INF'？

DELETE FROM banned_users
WHERE datetime < (NOW() - INTERVAL $ban MINUTE)
AND ban_length = 'INF';

score 0 · Accepted Answer

5.1.24 之后，mysql 为 INF，INF 和 NaN 提供了 NULL。如果你使用 mysql 大于 5.1.24，你可以试试这个：

DELETE FROM banned_users WHERE datetime < (NOW() - INTERVAL $ban MINUTE) AND ban_length=NULL

或者，你可以试试：</p>

DELETE FROM banned_users WHERE datetime < (NOW() - INTERVAL $ban MINUTE) AND ban_length=INF

4 回答 4