By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
| id | center | shelf_id | occupied | remaining |
|---|---|---|---|---|
| 1 | East | 1_1_1 | 1 | 3 |
| 2 | East | 1_1_2 | 1 | 1 |
| 3 | East | 1_1_3 | 1 | 0 |
| 4 | East | 1_1_4 | 1 | 0 |
| 5 | East | 1_1_5 | 1 | 2 |
| 6 | East | 1_2_1 | 1 | 1 |
| 7 | East | 1_2_2 | 1 | 0 |
| 8 | East | 1_2_3 | 0 | 4 |
| 9 | East | 1_2_4 | 0 | 4 |
| 10 | East | 1_2_5 | 0 | 4 |
| 11 | East | 1_3_1 | 0 | 4 |
| 12 | East | 1_3_2 | 0 | 4 |
| 13 | East | 1_3_3 | 0 | 4 |
| 14 | East | 1_3_4 | 0 | 0 |
| shelf_id | remaining | total |
|---|---|---|
| 1_1_1,1_1_2 | 3,1 | 4 |
| 1_1_5,1_2_1 | 2,1 | 3 |
| 1_2_3,1_2_4,1_2_5,1_3_1,1_3_2,1_3_3 | 4,4,4,4,4,4 | 24 |