| 75 | | |
| | 75 | == Секој ветеринарен центар колку вкупно миленичиња примил и колку е просечната возраст во секој ветеринарен центар. |
| | 76 | {{{ |
| | 77 | SELECT |
| | 78 | vc.name AS vet_center_name, |
| | 79 | -- vc.description AS vet_center_description, |
| | 80 | COUNT(DISTINCT pvvc.id_pets) AS number_of_pets_treated, |
| | 81 | AVG(EXTRACT(YEAR FROM age(current_date, p.dateofbirthday))) AS average_pet_age |
| | 82 | FROM |
| | 83 | project.vet_centers vc |
| | 84 | JOIN |
| | 85 | project.pets_visit_vet_centers pvvc ON vc.id = pvvc.id_vet_centers |
| | 86 | JOIN |
| | 87 | project.pets p ON pvvc.id_pets = p.id |
| | 88 | GROUP BY |
| | 89 | vc.id, vc.name, vc.description |
| | 90 | ORDER BY |
| | 91 | number_of_pets_treated DESC; |
| | 92 | }}} |