mysql - 更新最新记录

Question

我有以下 mysql 查询来更新我的 tblcem_appraisal_log 表

UPDATE tblcem_appraisal_log AS tblog
INNER JOIN (
            SELECT ta.id
            FROM tblcem_appraisal_log AS ta
            INNER JOIN tblcem_master_appraisal AS tm ON tm.id = ta.master_app_id        
            ORDER BY ta.id DESC
LIMIT 1) AS source ON source.id = tblog.id
SET tblog.quarter1 = tblcem_master_appraisal.quarter1 WHERE tblog.master_app_id=8;

尽管两个表中都存在quarter1列，但我收到错误未知列tblcem_master_appraisal.quarter1。 到底需要在 SET 中放入什么来更新 tblcem_master_appraisal 表中的值。

Answer 1

您必须选择子选择中的列并使用该表的别名:

  UPDATE tblcem_appraisal_log AS tblog
     INNER JOIN (
                SELECT ta.id, tm.quarter1 
                FROM tblcem_appraisal_log AS ta
                INNER JOIN tblcem_master_appraisal AS tm ON tm.id =    ta.master_app_id        
                ORDER BY ta.id DESC
    LIMIT 1) AS source ON source.id = tblog.id
    SET tblog.quarter1 = source.quarter1 WHERE tblog.master_app_id=8;