需要使用两个不同的 where 子句返回两组数据

2021-11-20 00:00:00 sql mysql

我有一张记录交易记录的表格.

I have a table that keeps track of transactions.

表格设置为:

transactions:

id, account_id, budget_id, points, type

我需要返回每个budget_id 的点总和，其中type = 'allocation' 和点总和，其中type = 'issue'

I need to return each budget_id's sum of points where type = 'allocation' and sum of points where type = 'issue'

我知道如何在一个查询中执行每个操作，但不能同时执行.

I know how to do each, but not both in one query.

预期结果集:

budget_id   allocated   issued
   434       200000      100
   242       100000      5020
   621       45000       3940

推荐答案

SELECT budget_id, 
       SUM(IF(type = 'allocation', points, 0)) AS allocated,
       SUM(IF(type = 'issue', points, 0)) AS issued
FROM transactions
GROUP BY budget_id

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