By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
Records: 12 Duplicates: 0 Warnings: 0
| id | name | parent_id |
|---|---|---|
| 21 | category21 | 20 |
| 20 | category20 | 19 |
| 19 | category19 | 0 |
Records: 12 Duplicates: 0 Warnings: 0
| id | name | parent_id |
|---|---|---|
| 21 | category21 | 20 |
| 20 | category20 | 19 |
| 19 | category19 | 0 |