Join all the tables together
In this last exercise, your task is to find the university city of the professor with the most affiliations in the sector "Media & communication".
For this,
- you need to join all the tables,
- group by some column,
- and then use selection criteria to get only the rows in the correct sector.
Let's do this in three steps!
Deze oefening maakt deel uit van de cursus
Introduction to Relational Databases in SQL
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
-- Join all tables
SELECT *
FROM affiliations
JOIN ___
ON affiliations.professor_id = professors.___
JOIN organizations
ON affiliations.organization_id = ___.___
JOIN ___
ON professors.___ = universities.id;