QUERY PLAN
Aggregate (cost=57.34..57.35 rows=1 width=8)
-> Sort (cost=56.06..56.27 rows=85 width=222)
Sort Key: s.created_at DESC
-> HashAggregate (cost=52.49..53.34 rows=85 width=222)
Group Key: s.id
-> Hash Right Join (cost=36.93..49.97 rows=1007 width=12)
Hash Cond: (thrs.task_group_id = s.id)
-> Seq Scan on tbl_task_group_head_of_relationships thrs (cost=0.00..5.70 rows=370 width=4)
-> Hash (cost=34.04..34.04 rows=231 width=12)
-> Hash Join (cost=23.57..34.04 rows=231 width=12)
Hash Cond: (s.head_of = u.id)
-> Hash Right Join (cost=5.91..15.08 rows=483 width=16)
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=4.85..4.85 rows=85 width=20)
-> Seq Scan on tbl_task_groups s (cost=0.00..4.85 rows=85 width=20)
-> Hash (cost=16.80..16.80 rows=69 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=69 width=4)
Filter: (department_id = 1)