不同之查询，并加入他们的行列

Question

我从同桌两个查询

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

输出：

用户id totalDeposite

---

1 470 
2 30 

查询

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

输出：

用户id totalFine

---

1 20 
2 30 

我怎样才能像

userId totalDeposite totalFine 
1  470   20 
2  30   30 

Answer 1

尝试结果使用case如下

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Answer 2

试试这个

select * from 
    (SELECT userId,SUM(amount) AS totalDeposite FROM trx GROUP BY userId) as tD 
    inner join 
    (SELECT userId,SUM(amount) AS totalFine FROM trx WHERE TYPE='fine' GROUP BY userId) 
    tF on td.userId = tf.userId