Question

我如何才能完成这项工作 - 给我＃1093 - 您无法在FROM子句中为更新指定目标表'Orders'

Update Orders set flag = 0 where orders_id = (select orders_id from orders ORDER BY orders_id DESC LIMIT 1)

Answer 1

您需要将其包装在子查询中（创建临时表）

Update Orders 
set flag = 0 
where orders_id = 
    (
        SELECT x.orders_id
        FROM
        (
            select orders_id 
            from orders 
            ORDER BY orders_id DESC 
            LIMIT 1
        ) x
    )

或

Update Orders 
set flag = 0 
where orders_id = 
    (
        SELECT x.orders_id
        FROM
        (
            select MAX(orders_id) orders_id 
            from orders 
        ) x
    )

Answer 2

看起来你正在尝试更新表格中的最后一个订单？尝试

Update Orders set flag = 0 ORDER BY orders_id DESC LIMIT 1;

Mysql不支持在子查询中使用它时更新表。

使用选择子选择更新语句

2 个答案: