QUERY PLAN
Limit (cost=52.65..52.68 rows=10 width=389)
-> Sort (cost=52.65..52.88 rows=92 width=389)
Sort Key: s.created_at DESC
-> HashAggregate (cost=49.05..50.66 rows=92 width=389)
Group Key: s.id
-> Hash Right Join (cost=37.72..48.72 rows=135 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=37.39..37.39 rows=26 width=369)
-> Hash Right Join (cost=30.17..37.39 rows=26 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=30.10..30.10 rows=6 width=369)
-> Hash Join (cost=16.93..30.10 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=10 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=10 width=4)
Filter: (department_id = 4)