Question

What is the result of the following SQL query?

SELECT * FROM Person p INNER JOIN Actor a ON p.person_id = a.actor_id INTERSECT SELECT * FROM Person p INNER JOIN Director d ON p.person_id = d.director_id;

Answer 1

The result of the given SQL query is the intersection of records from the tables 'Person', 'Actor', and 'Director'

Step-by-step explanation:

The result of the given SQL query is the intersection of records from the tables 'Person', 'Actor', and 'Director'. The query selects all columns from the 'Person' table where the 'person_id' matches with 'actor_id' in the 'Actor' table, and also selects all columns from the 'Person' table where the 'person_id' matches with 'director_id' in the 'Director' table.

The result of the SQL query SELECT * FROM Person p INNER JOIN Actor a ON p.person_id = a.actor_id INTERSECT SELECT * FROM Person p INNER JOIN Director d ON p.person_id = d.director_id is a set of records that represent people who are both actors and directors. The INTERSECT operator returns only the common records that result from the two queries. Essentially, it lists individuals from the Person table whose ids both appear in the Actor table and the Director table, implying that the person holds both roles.