mysql错误：'on子句'中的未知列'thread.threadid'

Question

我收到以下错误...

ERROR:
mysql error: Unknown column 'thread.threadid' in 'on clause'

我听说它与 MySQL 版本有关...我需要对我的 PHP 代码进行哪些更改才能通过此错误？我读到这个错误是因为在 SELECT 查询中使用了逗号运算符。此查询不适用于新的 MySQL 5 严格查询解析器，后者将逗号视为低于连接的优先级。

Database error in vBulletin 3.0.7:

Invalid SQL: 
    SELECT thread.threadid, thread.forumid
    FROM thread AS thread, subscribethread AS subscribethread
    LEFT JOIN deletionlog AS deletionlog ON(deletionlog.primaryid = thread.threadid AND type = 'thread')
    WHERE subscribethread.threadid = thread.threadid
    AND subscribethread.userid = 1
    AND thread.visible = 1
    AND lastpost > 1277054898
    AND deletionlog.primaryid IS NULL

mysql error: Unknown column 'thread.threadid' in 'on clause'

mysql error number: 1054

SELECT thread.threadid, thread.forumid中的逗号可以简单去掉吗？

请解释...

Answer 1

您想将thread 与deletionlog 联接，但查询正在尝试将subscribethread 与deletionlog 联接。替换为：

FROM subscribethread AS subscribethread, thread AS thread
LEFT JOIN deletionlog AS deletionlog ON(deletionlog.primaryid = thread.threadid AND type = 'thread')