QUERY PLAN
Aggregate (cost=48.92..48.93 rows=1 width=8)
-> Sort (cost=47.99..48.15 rows=62 width=222)
Sort Key: s.created_at DESC
-> HashAggregate (cost=45.53..46.15 rows=62 width=222)
Group Key: s.id
-> Hash Right Join (cost=35.11..45.37 rows=62 width=12)
Hash Cond: (turs.task_group_id = s.id)
-> Seq Scan on tbl_task_group_user_relationships turs (cost=0.00..7.83 rows=483 width=4)
-> Hash (cost=34.96..34.96 rows=12 width=12)
-> Hash Right Join (cost=30.19..34.96 rows=12 width=12)
Hash Cond: (thrs.task_group_id = s.id)
-> Seq Scan on tbl_task_group_head_of_relationships thrs (cost=0.00..3.93 rows=193 width=4)
-> Hash (cost=30.11..30.11 rows=6 width=12)
-> Hash Join (cost=16.91..30.11 rows=6 width=12)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..12.94 rows=94 width=20)
-> Hash (cost=16.80..16.80 rows=9 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=9 width=4)
Filter: (department_id = 9)