By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
8 rows affected
| categories | cross_categories | counts |
|---|---|---|
| 10 | 10 | 1 |
| 10 | 30 | 2 |
| 10 | 50 | 1 |
| 30 | 10 | 2 |
| 30 | 30 | 1 |
| 50 | 10 | 1 |
8 rows affected
| categories | cross_categories | counts |
|---|---|---|
| 10 | 10 | 1 |
| 10 | 30 | 2 |
| 10 | 50 | 1 |
| 30 | 10 | 2 |
| 30 | 30 | 1 |
| 50 | 10 | 1 |