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问题描述
我有两个表 Orders 和 Order_DetailsOrder_Details 表的 order_id 字段充当 Orders 表的 id_order 表的外键.
I have two tables Orders and Order_Details
Order_Details tables's order_id field acts as foreign key to Orders table's id_order table.
我想用 Order_Details 表中的价格总和来更新 Orders 表的 price_total 字段.
I want to update the price_total field of Orders table with summation of prices from Order_Details table.
我尝试了以下查询但失败了:-
I tried with the following query but failed:-
Update Orders, Order_Details
SET Orders.price_total = sum(Order_Details.price)
WHERE Orders.price_total=0
GROUP BY Order_Details.id_order
错误 -
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY Order_Details.id_order' at line 4
如何在一个查询中完成?
How to do it in one query?
谢谢
推荐答案
可以简化为
Update Orders
SET Orders.price_total =
(
SELECT
sum(Order_Details.price)
FROM Order_Details
WHERE
Orders.id_order=Order_Details.order_id
)
WHERE Orders.price_total=0;
<罢工>更新分组
Update Orders, Order_Details
SET Orders.price_total = sum(Order_Details.price)
WHERE
Orders.price_total=0 AND
Orders.id_order=Order_Details.order_id
GROUP BY Order_Details.id_order
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