3张表统计商品价格

Question

我有 3 tables 来计算商品价格，我也需要知道花费的总额，

table数据

id	name
1	data
2	data2

详情

id	data id	item	price
1	1	bag	2000
2	1	chair	2000

table 花了

id	detail id	spent
1	1	200
2	1	200

预期结果 -> 数据 | 4000 | 400

Answer 1

SELECT data.name, d.price, s.spent
FROM data
JOIN ( SELECT data_id id, SUM(price) price
       FROM detail
       GROUP BY id ) d USING (id)
JOIN ( SELECT detali_id id, SUM(spent) spent
       FROM spent
       GROUP BY id ) s USING (id)

3张表统计商品价格

3 tables to count the item price

mysql

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