您不能在FROM子句中指定要更新的目標表'b'

Question

我需要知道在此sql語句中我在哪里做錯了。 我嘗試在類似問題的先前線程中找到解決方案，但沒有一個可以解決我的問題。 所以我認為也許我的陳述實際上是錯誤的。

UPDATE table1 b

LEFT JOIN table2 m ON b.ICNO=m.ICNO

SET b.SalMoveMth = '01'

WHERE
    m.Status!='6' AND 
    (DATE_FORMAT(startDateSand,'%m')='10' OR DATE_FORMAT(startDateSand,'%m')='11' OR 
        DATE_FORMAT(startDateSand,'%m')='12') AND 
    ((SELECT SalMoveMth FROM table1 WHERE ICNO=table2.ICNO ORDER BY SalMoveMthStDt DESC LIMIT 1)!='10').

謝謝。

Answer 1

where子句的最后一部分：

代替 ：

where ICNO=table2.ICNO order by SalMoveMthStDt desc limit 1)!='10')

嘗試：

where ICNO=table2.ICNO order by SalMoveMthStDt desc limit 1)<>'10')

還：

and b.SalMoveMth in (
((select SalMoveMth from table1 where ICNO=table2.ICNO order by 
SalMoveMthStDt desc limit 1)<>'10'))

Answer 2

update table1 
set SalMoveMth = '01' where icno in 
  (select b.ICNO from table1 b 
   left join table2 m on b.ICNO=m.ICNO
   where m.Status!='6' 
   and (DATE_FORMAT(startDateSand,'%m')='10' or 
        DATE_FORMAT(startDateSand,'%m')='11' or 
        DATE_FORMAT(startDateSand,'%m')='12') 
   and b.SalMoveMth in (
     ((select SalMoveMth 
       from table1 
       where ICNO=table2.ICNO 
       order by SalMoveMthStDt desc limit 1)<>'10')
  )