By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
CREATE TABLE
INSERT 0 7
| id_employe | id_function | ddate |
|---|---|---|
| 1 | null | 1 |
| 1 | null | 2 |
| 1 | 3 | 3 |
| 1 | 3 | 4 |
| 1 | 3 | 5 |
| 1 | null | 6 |
| 1 | null | 7 |
SELECT 7
| id_employe | id_function | start_date | end_date |
|---|---|---|---|
| 1 | null | 1 | 2 |
| 1 | 3 | 3 | 5 |
| 1 | null | 6 | 7 |
SELECT 3