Question

我有两个oracle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';

它有效。但第二次查询对我来说更难

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？我正在尝试将其更改为第一次使用JOIN查询，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;

更新：您无法指定目标表＆＃39;表＆＃39;用于FROM子句中的更新

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