Mysql get multi row value in get single field

Table : user
--------------
| Id | Name  |
--------------
|  1 | Test  |
|  2 | Test1 |
|  3 | TEst2 |
|  4 | Test3 |
|  5 | Test4 |
|  6 | Test5 |
|  7 | Test6 |
--------------

Query :
select group_concat(concat(id) SEPARATOR ',') from user

Output:
1,2,3,4,5,6,7