SQL命令按日期

Question

總結數據組我有一個包含數據庫：

+----+---------------------+-------------+-----------------+ 
| id | date    |   pay|  usr_type | 
+----+---------------------+-------------+-----------------+ 
| 1 | 2016-10-17   |   500|    boss| 
| 2 | 2016-10-17   |   200|    boss| 
| 3 | 2016-10-24   |   300|    user| 
| 4 | 2016-10-24   |   100|    user| 
+----+---------------------+-------------+-----------------+ 

我想要的結果是這樣的：

+---------------------+-------------+-----------------+ 
| date    |   user|    boss| 
+----+---------------------+--------+-----------------+ 
| 2016-10-17   |   0|    700| 
| 2016-10-24   |   400|    0| 
+----+---------------------+-------------+------------+ 

Answer 1

下面是使用conditional aggregation一個選項：

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