PHP MYSQL輸出均勻值，以相同的表列

Question

我有一個表在我的MySQL像下面

============================ 
id | courses | r_number 
---------------------------- 
1 | English | C/009 
2 | Maths  | C/009 
3 | English | C/003 
4 | Maths  | C/002 
============================ 

如何輸出中這是像HTML見下表

==================================== 
id | courses   | r_number 
------------------------------------ 
1 | English, Maths | C/009 
2 | English   | C/003 
3 | Maths    | C/002 
==================================== 

Answer 1

SELECT MIN(ID) ID, 
     GROUP_CONCAT(Courses SEPARATOR ', ') Courses, 
     r_Number 
FROM TableName 
GROUP BY r_Number 
ORDER BY ID 

• SQLFiddle Demo

我想知道爲什麼在你的例子中ID與記錄不符，爲什麼？