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create table users (id int, user_id int, a_id int, b_id int);
insert into users values (1, 1, 2, 4),(5, 1, 7, 5),(7, 1, 3, 4),(8, 1, 9, 5);
select
row.user_id, count(*) matches_row_count
from users user_row
join users row on
(user_row.a_id = row.a_id) and
(user_row.b_id = row.b_id) and
(user_row.id != row.user_id)
where user_row.user_id = 1
group by row.user_id;
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