MySQL的選擇不同沒有得到所需的查詢結果

Question

我有以下數據的數據庫表：

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

我的問題是，我無法作出查詢，以產生這樣的結果：

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

提前致謝。

Answer 1

的group_concat聚合函數正是醫生下令：

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

Answer 2

試試這個：

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