Question

我有两张桌子：

用户

| id | amount | 
---------------
| 1  | 10     | 
| 2  | 20.50  | 
| 3  | 0      | 
| 4  | 80     | 
| 5  | 0      | 
---------------

vehicle_travel

| id | user_id | costprice | status  |
--------------------------------------
| 1  | 1       | 80.00     | active  |
| 2  | 1       | 20.00     | expired |
| 3  | 2       | 130.50    | active  |
| 4  | 5       | 325.00    | active  |
| 5  | 3       | 99.50     | expired |
--------------------------------------

我想UPDATE 用户表和SET users.amount 到 users.amount + vehicle_travel.costprice WHERE users.id 等于 vehicle_travel.user_id AND vehicle_travel.status 等于'过期'

这是我的完整查询：

UPDATE users 
SET users.amount=users.amount+vehicle_travel.costprice 
WHERE users.id=vehicle_travel.user_id 
AND vehicle_travel.status='expired'

但我不断从phpMyAdmin获得未知列错误。

我做错了什么？

Answer 1

试试这个;）

UPDATE users 
INNER JOIN vehicle_travel
ON users.id = vehicle_travel.user_id
AND vehicle_travel.status = 'expired'
SET users.amount = users.amount + vehicle_travel.costprice

<强> 编辑：

UPDATE users 
INNER JOIN (
    SELECT SUM(costprice) AS costprice, user_id
    FROM vehicle_travel
    WHERE status = 'expired'
    GROUP BY user_id
) vehicle_travel
ON users.id = vehicle_travel.user_id
SET users.amount = users.amount + vehicle_travel.costprice

Answer 2

您需要使用JOIN。如果您没有指定表名，那么对于那些引用未指定表的列，您将遇到未知列错误。

UPDATE users 
INNER JOIN vehicle_travel ON vehicle_travel.user_id = users.id
SET users.amount=users.amount+vehicle_travel.costprice 
WHERE vehicle_travel.status='expired'

UPDATE表与另一个表中的WHERE多个条件

2 个答案: