mysql - 更新: You can't specify target table 'table' for update in FROM clause

Question

我有两个关于 oracle 的查询。我需要为 mysql 修改它们。 第一个查询:

 UPDATE tec_onoff_file a
 SET emailtype = 'MIGR'
 WHERE EXISTS
    (SELECT 1
       FROM tec_onoff_file
       WHERE emailtype = 'MIGR'
       AND a.acctnbr = acctnbr
       AND a.magabbr = magcodes);

我把它改成了

update tec_onoff_file t1
join tec_onoff_file t2
    on t2.emailtype='MIGR'
    and t1.acctnbr=t2.acctnbr
    and t1.magabbr=t2.magcodes
    set t1.emailtype='MIGR';

并且它有效。 但第二个查询对我来说更难

update tec_onoff_file a
set emailtype = 'REIN'
where transtype = 'REIN'
and curracctnbr not in (select curracctnbr from tec_onoff_file b
    where emailtype ='RENW'
    and a.curracctnbr=b.curracctnbr);

有人可以帮忙吗？我正在尝试像第一次使用 JOIN 查询一样更改它，但它失败了，我不知道该怎么做。

Answer 1

UPDATE tec_onoff_file a
  LEFT 
  JOIN tec_onoff_file n
    ON b.curracctnbr = a.curracctnbr 
   AND b.emailtype ='RENW'
   SET emailtype = 'REIN'
 WHERE a.transtype = 'REIN'
   AND b.transtype IS NULL;