Homework Question :: Tried very hard :: Need Direction - sqlite

Question

I have been stuck on this progressive question for more than 10 days now
Questions is :: Find all the actors that made more movies with Yash Chopra than any other director
Heres my attempt
SELECT pidsWhoDidMoviesWithYashChopra.pid,
pidsWhoDidMoviesWithYashChopra.moviesWithYashChopra,
pidsOfThoseWhoDidMoviesWithDirectors.moviesByAPID,
pidsWhoDidMoviesWithYashChopra.countOfMoviesWithYashChopraByAPID,
pidsOfThoseWhoDidMoviesWithDirectors.totalNumberOfMoviesByAPID
FROM
(
SELECT TRIM(M_Cast.PID) AS pid, moviesByYashChopra.mDirectorMID AS moviesWithYashChopra, COUNT(moviesByYashChopra.mDirectorMID) AS countOfMoviesWithYashChopraByAPID
FROM M_Cast
JOIN
(
SELECT TRIM(M_Director.MID) AS mDirectorMID
FROM
M_Director
WHERE TRIM(M_Director.PID) IN
(
SELECT TRIM(Person.PID) AS personPID
FROM
Person
WHERE Person.Name LIKE '%Yash Chopra%'
)
) AS moviesByYashChopra
ON TRIM(M_Cast.MID) == moviesByYashChopra.mDirectorMID
GROUP BY pid
) AS pidsWhoDidMoviesWithYashChopra
JOIN
(
SELECT TRIM(M_Cast.PID) AS pid, TRIM(M_Cast.MID) AS moviesByAPID, COUNT(TRIM(M_Cast.MID)) AS totalNumberOfMoviesByAPID
FROM M_Cast
GROUP BY pid
) AS pidsOfThoseWhoDidMoviesWithDirectors
ON pidsWhoDidMoviesWithYashChopra.pid == pidsOfThoseWhoDidMoviesWithDirectors.pid
GROUP BY pidsWhoDidMoviesWithYashChopra.pid
And here's the output it produces
And here's the schema
Now where I require help is :: Ability to go ahead from here :: As in how do i dissect this part of the question "than any other director." :: I think that's the tricky part
Any direction/hints will be helpful, Thanks...

Answer 1

You need to join person (for the actor's details) with m_cast, movie, m_director and person again (for the director's details) and group by actor and director to count the number of movies each actor made with each director.
Then use window functions first_value() to get the name of the director with whom the actor made the most movies and lag() to get the 2nd max number of movies (this is needed to filter out ties).
Enclose this query inside a CTE and then filter:
with cte as (
select pa.pid, pa.name, count(*) counter,
first_value(pd.name) over (partition by pa.pid, pa.name order by count(*) desc) max_dir_name,
lag(count(*)) over (partition by pa.pid, pa.name order by count(*) desc) prev_counter
from person pa
inner join m_cast c on c.pid = pa.pid
inner join movie m on m.mid = c.mid
inner join m_director d on d.mid = m.mid
inner join person pd on pd.pid = d.pid
group by pa.pid, pa.name, pd.name
)
select pid, name, counter
from cte
where max_dir_name = 'Yash Chopra' and coalesce(prev_counter, 0) < counter