MySQL选择明显不能获得所需的查询结果

Question

我有一个包含以下数据的数据库表：

+--------------------+-----------------------------+  
|    order_no        |   part                      |   
+--------------------+-----------------------------+  
| AAAAAAAAAAAAA      |  QQQQQQQQ-WWW               |  
| AAAAAAAAAAAAA      |  EEEEEEEE-TTT               |  
| BBBBBBBBBBBBB      |  33333333-333               |  
| BBBBBBBBBBBBB      |  44444444-444               |  
| BBBBBBBBBBBBB      |  EEEEEEEE-TTT               |  
+--------------------+-----------------------------+

我的问题是，我无法进行查询以产生此结果：

+----------------+-------------------------------------------+
|    order_no    |   part                                    |
+----------------+-------------------------------------------+
| AAAAAAAAAAAAA  |  QQQQQQQQ-WWW, EEEEEEEE-TTT               |  
| BBBBBBBBBBBBB  |  33333333-333, 44444444-444, EEEEEEEE-TTT |  
+----------------+-------------------------------------------+  

提前致谢。

Answer 1

group_concat聚合功能正是医生所要求的：

SELECT   order_no, GROUP_CONCAT(part SEPARATOR ', ')
FROM     mytable
GROUP BY order_no

Answer 2

试试这个：

SELECT order_no, GROUP_CONCAT(string SEPARATOR ', ') FROM table GROUP BY order_no;