MySQL的选择不同没有得到所需的查询结果

Question

我有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，我无法作出查询，以产生这样的结果：

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

提前致谢。

Answer 1

的group_concat聚合函数正是医生下令：

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;