Question

尝试删除某些条件但MySQL抛出错误的记录： Error Code: 1093

delete from tbl1
where date(cast(traptime as datetime))< date_sub(current_date, interval 200  day) and 
id not in (select max(id) as id from tbl1 group by device_name);

Answer 1

试试这个：

DELETE FROM tbl1
WHERE id NOT IN (
    SELECT id FROM (
        select max(id) as id from tbl1 group by device_name
    ) AS c
)
and date(cast(traptime as datetime))< date_sub(current_date, interval 200  day)

Answer 2

在MySQL中，您无法修改在SELECT部分中使用的同一个表。在这里看到答案： MySQL Error 1093 - Can't specify target table for update in FROM clause

错误代码：1093。您无法在FROM子句中指定目标表'tbl1'进行更新（删除查询）

2 个答案: