本文介绍了MySQL内连接和两列求和的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下表格
表格:约会
ID | PRICE | PAID
48 | 100 | 180
表格:约会产品
ID | APPOINTMENT_ID | PRODUCT_ID | TOTAL
10 | 48 | 1 | 30
11 | 48 | 9 | 30
12 | 48 | 6 | 30
我想以某种方式运行一个 MySQL 查询:
I Would like to somehow run a MySQL query that will:
a) 加入这两个表，对每个约会 ID 的约会产品的总计"求和，如果付费"不等于价格(来自约会表)+总计(来自约会产品表)，则显示它.
a) join the two tables, SUM the "TOTAL" of appointments_products for each appointment_id and if the "PAID" is not equal of the PRICE (from appointments table) + TOTAL (from appointments_products table) then to show it.
这是我到目前为止所做的:
This is what I have done so far:
select a.*, b.appointment_id as AppId, b.total as ProdTotal
from appointments a
INNER JOIN appointments_products b ON a.id = b.appointment_id
但是这个查询不会对每个约会ID的总数求和
But this query does not sum the total for each appointment_id
推荐答案
select a.ID,a.PRICE,a.PAID,a.id as AppId,
sum(b.total) as ProdTotal
from appointments a
INNER JOIN appointments_products b ON a.id = b.appointment_id
group by a.ID,a.PRICE,a.PAID;
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