表A
+--------------+
| ID |
+--------------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+--------------+ 期待结果为
+--------------+
| ID |
+--------------+
| 1,2,3,4,5|
+--------------+
+--------------+
| ID |
+--------------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
+--------------+ 期待结果为
+--------------+
| ID |
+--------------+
| 1,2,3,4,5|
+--------------+
select group_concat(id) as ID from A