Question

我有一个查询，该查询在运行时提供令人满意的结果，该查询如下：-

SELECT DISTINCT(cp.payment_ref),COUNT(cp.status) as 'Amount Declined',cp.*
                FROM client_payments as cp
                WHERE DATE(cp.payment_date) = CURDATE()
                GROUP BY cp.payment_ref
                HAVING COUNT(cp.status='Declined')=3

我想要做的是使用标签更新查询的结果，所以我要做的就是将查询转换为更新查询，以更新结果集。我无法使它正常工作..这是我的最佳尝试

UPDATE client_payments SET retry_status = 'retry' WHERE id=(SELECT cp.id ,COUNT(cp.status)
                FROM client_payments as cp
                WHERE DATE(cp.payment_date) = '2018-09-24'
                GROUP BY cp.payment_ref
                HAVING COUNT(cp.status='Declined')=3)

这会引发错误#1093 - You can't specify target table 'client_payments' for update in FROM clause

有什么想法吗？

Answer 1

您需要来自条款：

UPDATE client_payments SET client_payments.retry_status = 'retry' 
from(SELECT cp.id ,COUNT(cp.status)
            FROM client_payments as cp
            WHERE DATE(cp.payment_date) = '2018-09-24'
            GROUP BY cp.payment_ref
            HAVING COUNT(cp.status='Declined')=3) as myquery
WHERE client_payments.id=myquery.id

Answer 2

因此可行的解决方案如下：-

UPDATE client_payments as cp1
INNER JOIN (SELECT cp.id ,COUNT(cp.status)
        FROM client_payments as cp
        WHERE DATE(cp.payment_date) = '2018-09-24'
        GROUP BY cp.payment_ref
        HAVING COUNT(cp.status='Declined')=3) as cp2 on cp1.id = cp2.id
SET cp1.retry_status = 'retry'

感谢穆罕默德的{动和this post中的mellamokb的启发。

将成功的MySQL查询转换为更新

2 个答案: