我得到了这个数据库:
| id | sl_address | sl_type |
|---------|-------------|--------------|
| 1 | Street 1 | GDS |
| 2 | Place 3 | Standard |
| 3 | Highway 9 | Excellent |
| 4 | Street 2 | Excellent |
| 5 | Square 3 | GDS |
| 6 | Plaza 7 | Standard |
| 7 | Street 3 | Excellent |
我想按 sl_type 显示结果组,但不按字母顺序(标准、GDS、优秀)。