select *, ROUND(cast(b.points as decimal) / b.max_points * 100) as percents,
AVG(score_five)
from group_custom_tests a
join custom_tests_results b
on a.id = b.custom_test_id
where a.group_id = 69
and a.format = 'Вто рой' and b.subject_id = 14
GROUP BY a.id, b.id


select distinct on(format) id, format, group_id from group_custom_tests
 where group_id = 69


select distinct b.subject_id, c.name as subject_name
from group_custom_tests a
join custom_tests_results b
on a.id = custom_test_id
join subjects c
on b.subject_id = c.id
where a.group_id = 69 and a.format = 'Вто рой'