By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
CREATE TABLE
| id | how_many_to_generate |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 0 |
| 5 | 1 |
INSERT 0 5
| id | how_many_to_generate | generate_series |
|---|---|---|
| 1 | 1 | 1 |
| 3 | 2 | 1 |
| 3 | 2 | 2 |
| 5 | 1 | 1 |
SELECT 4
CREATE TABLE
| id | how_many_to_generate |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 0 |
| 5 | 1 |
INSERT 0 5
| id | how_many_to_generate | generate_series |
|---|---|---|
| 1 | 1 | 1 |
| 3 | 2 | 1 |
| 3 | 2 | 2 |
| 5 | 1 | 1 |
SELECT 4