我有三个表和我需要总额分开。此外,我将使用选择或where子句的字段。Mysql左连接和总和
SELECT i.*, x.* FROM items AS i
LEFT JOIN
(
SELECT
p.item_id
,SUM(p.amount) AS saleAmount
,SUM(IF(p.type=1,pa.amount,0)) AS paidAmount
FROM payments AS p
LEFT JOIN payment_actions AS pa ON pa.payment_id=p.id
GROUP BY p.id
) AS x ON x.item_id=i.id
items table;
id
---
1
付款表;
id | item_id | amount
---------------------------
1 | 1 | 300
payment_actions表;
id | payment_id | amount
---------------------------
1 | 1 | 100
1 | 1 | 50
结果应该是;
saleAmount | paidAmount
--------------------------
300 | 150
什么是你想要的输出,并请张贴一些示例数据的简单方法? – 2013-05-02 11:13:06
我更新了问题 – 2013-05-02 11:19:17