Ниво 10.9 SQL задатака
Дате су табеле:
| id | name | registration_date |
|---|---|---|
| 1 | John | 2022-05-10 |
| 2 | Max | 2022-01-10 |
| 3 | Andrew | 2022-10-31 |
| 4 | Joe | 2022-11-30 |
| 5 | Karl | 2022-07-31 |
| id | user_id | click_date |
|---|---|---|
| 1 | 3 | 2023-12-06 |
| 2 | 1 | 2023-12-05 |
| 3 | 2 | 2023-12-01 |
| 4 | 5 | 2023-11-12 |
| 5 | 4 | 2023-11-11 |
| 6 | 1 | 2023-10-14 |
| 7 | 2 | 2023-10-10 |
| 8 | 3 | 2023-11-30 |
| 9 | 4 | 2023-12-05 |
| 10 | 4 | 2023-12-01 |
| 11 | 5 | 2023-12-08 |
| 12 | 3 | 2023-11-27 |
| 13 | 2 | 2023-11-28 |
| 14 | 1 | 2023-12-09 |
| 15 | 5 | 2023-12-10 |
| 16 | 5 | 2023-11-30 |
| 17 | 2 | 2023-11-12 |
| id | user_id | date |
|---|---|---|
| 1 | 3 | 2023-12-12 |
| 2 | 1 | 2023-12-05 |
| 3 | 2 | 2023-12-01 |
| 4 | 5 | 2023-11-12 |
| 5 | 4 | 2023-11-11 |
| 6 | 1 | 2023-10-14 |
| 7 | 2 | 2023-10-10 |
| 8 | 3 | 2023-11-30 |
| 9 | 4 | 2023-12-05 |
| 10 | 4 | 2023-12-01 |
| 11 | 5 | 2023-12-08 |
| 12 | 3 | 2023-11-27 |
| 13 | 2 | 2023-11-28 |
| 14 | 1 | 2023-12-09 |
| 15 | 5 | 2023-12-10 |
| 16 | 5 | 2023-11-30 |
| 17 | 2 | 2023-11-12 |
Решите за њих следеће задатке:
Процените ефикасност рекламне кампање на основу конверзије и трошкова по клику.
