How to filter SQL results in a has-many-through relation

Question

Assuming I have the tables student, club, and student_club:

student {
    id
    name
}
club {
    id
    name
}
stude         


        

Answer 1

SELECT s.stud_id, s.name
FROM   student s,
(
select x.stud_id from 
student_club x 
JOIN   student_club y ON x.stud_id = y.stud_id
WHERE  x.club_id = 30
AND    y.club_id = 50
) tmp_tbl
where tmp_tbl.stud_id = s.stud_id
;

Use of fastest variant (Mr. Sean in Mr. Brandstetter chart). May be variant with only one join to only the student_club matrix has the right to live. So, the longest query will have only two columns to calculate, idea is to make the query thin.