来自同一个表的不同总和查询并加入它们

Question

我有两个来自同一个表的查询

SELECT userId,SUM(amount) AS totalDeposite FROM trx GROUP BY userId

输出:

userId totalDeposite

---

 1   470
 2   30

询问

SELECT userId,SUM(amount) AS totalFine FROM trx WHERE TYPE='fine' GROUP BY userId

输出:

userId totalFine

---

 1    20
 2    30

我怎样才能得到像这样的结果

userId totalDeposite  totalFine
1       470           20
2       30            30

Answer 1

尝试使用case如下

SELECT userId,
       SUM(case when TYPE='fine' then amount else 0 end) as totalFine, 
       SUM(amount) AS totalDeposite
FROM trx 
GROUP BY userId