SqlAlchemy: filter to match all instead of any values in list?

Question

I want to query a junction table for the value of column aID that matches all values of a list of ids ids=[3,5] in column bID.

Answer 1

You are looking for a query that works on sets of rows. I think a group by with having clause is the best approach:

select aid
from jt
where bid in ()
group by aid
having count(distinct bid) = 2

If you can put the ids that you desire in a table, you can do the following more generic approach:

select aid
from jt join
     bids
     on jf.bid = bids.bid
group by aid
having count(distinct jt.bid) = (select count(*) from bids)