MySQL 4.1- 不兼容示例它不会造成任何影响，除非不一致的数据没有得到解决，在这种情况下
更新错误：
UPDATE
xoops_bb_forums
SET
xoops_bb_forums .forum_last_post_id = @last_post =
(
SELECT MAX(post_id) AS last_post FROM xoops_bb_posts WHERE approved =1 AND forum_id = xoops_bb_forums .forum_id )
WHERE
xoops_bb_forums .forum_last_post_id <> @last_post |
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