QUERY PLAN
Limit (cost=52.42..52.44 rows=10 width=393)
-> Sort (cost=52.42..52.65 rows=92 width=393)
Sort Key: s.created_at DESC
-> HashAggregate (cost=48.82..50.43 rows=92 width=393)
Group Key: s.id
-> Hash Right Join (cost=37.67..48.52 rows=121 width=369)
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=37.38..37.38 rows=23 width=369)
-> Hash Right Join (cost=30.16..37.38 rows=23 width=369)
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=30.09..30.09 rows=6 width=369)
-> Hash Join (cost=16.91..30.09 rows=6 width=369)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..12.92 rows=92 width=369)
-> 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)