Referencing a past query in a loop SQLite - sqlite

Question

I want to intersect two or more results from a query from a for loop
My code takes in strings from the command line and checks the database for movies with matching actors
movie database
id | name
actor database
id | name
acting
movie_id | actor_id
i.e.
inp = sys.argv[1]
query =
'''
SELECT m.name
FROM movie m
JOIN acting ag on m.id = ag.movie_id
JOIN actor a on a.id = ag.actor_id
WHERE a.name = ?
'''
cur.execute(query, (inp,))
for tup in cur.fetchall:
print(tup)
This program would get all the movies with actor called David
./program "David'
The Secret Life of Pets
The Big Short
Concussion
A Most Violent Year
Baggage Claim
Skyfall
Drive
Albert Nobbs
The Book of Eli
Shine a Light
The Bourne Ultimatum
The Simpsons Movie
I want to extend my program to take in multiple arguments, taking in multiple names of actors, where the actors act in the same movie.
Possible code?
for index in range(len(sys.argv - 1)):
# insert code here
I think I should use an intersection of the outputs of the queries, but I don't know how to do that.
This is the output of movies that both Albert and David
./program "Albert" "David"
A Most Violent Year
Baggage Claim
The Simpsons Movie

Answer 1

You can use aggregation to construct a query that returns the common movies of all actors that you pass as arguments:
query = """
SELECT m.name
FROM movie m
JOIN acting ag on m.id = ag.movie_id
JOIN actor a on a.id = ag.actor_id
WHERE ',' || ? || ',' LIKE '%,' || a.name || ',%'
GROUP BY m.id, m.name
HAVING COUNT(*) = ?
"""
cur = con.cursor()
cur.execute(query, (','.join(sys.argv[1:]), len(sys.argv)-1))
for tup in cur.fetchall():
print(tup[0])