mysql - 删除mysql并加入where

Question

我的 sql 中的以下查询抛出“您无法在 FROM 子句中指定用于更新的目标表 'd'”

DELETE FROM d 
using mdm_certificate_data as d  
where d.trash = 1 and d.modified_at <= DATE_SUB(NOW(), INTERVAL 30 DAY) 
AND NOT EXISTS 
    (select e.serial_number as serial_number 
        FROM mdm_certificate_data e 
        WHERE e.serial_number = d.serial_number 
        and e.serial_number IN ('12345','1234567'));

有人可以帮我重写查询吗？

Answer 1

如果您要对表执行UPDATE/INSERT/DELETE，则无法在内部查询中引用该表(但是，您可以引用该外部表中的字段)。 ..)

重写此方法的一种方法是，

DELETE FROM d 
using mdm_certificate_data as d  
where d.trash = 1 and d.modified_at <= DATE_SUB(NOW(), INTERVAL 30 DAY) 
AND NOT EXISTS 
    (select temp.serial_number as serial_number 
        FROM (select e.serial_number from mdm_certificate_data) temp
            WHERE temp.serial_number = d.serial_number 
            and temp.serial_number IN ('12345','1234567'));