Question

我们如何在mysql中运行这些类型的查询？

一个人帮我执行这些类型的查询我们如何在mysql中运行。更新连接查询

UPDATE file_master t1,users t2 SET
    t1.Status = "cancel", 
    t1.is_credit_revers=1, 
    t1.is_credit_reversed=1,
    t1.t_reversal=t1.credit,
    t2.credit=t1.credit+
     (
       select sum(t1.credit) from file_master where FileID in(7,6,5)
     )
WHERE t1.FileID in(7,6,5) 
and t1.CRN=t2.id 
and t1.CRN=1 ;

1093 - 表＆＃39; t1＆＃39;被指定两次，两者都作为＆＃39;更新＆＃39;的目标。并作为数据的单独来源

Answer 1

MySQL对象更新也在子查询中的表

您有时可以在另一个子查询中隐藏子查询以解决此问题。

因此尝试这样的事情： -

UPDATE file_master t1
INNER JOIN users t2 
ON t1.CRN = t2.id 
CROSS JOIN
(
    SELECT credit_sum
    FROM
    (
        SELECT SUM(credit) AS credit_sum 
        FROM file_master 
        WHERE FileID IN(7,6,5)
    ) t3
) t4
SET t1.Status = "cancel", 
t1.is_credit_revers = 1, 
t1.is_credit_reversed = 1,
t1.t_reversal = t1.credit,
t2.credit = t1.credit + t4.credit_sum
WHERE t1.FileID in(7,6,5) 
AND t1.CRN = 1 ;

mysql更新连接查询

1 个答案: