QUERY PLAN
Limit (cost=52.49..52.51 rows=10 width=388)
-> Sort (cost=52.49..52.72 rows=94 width=388)
Sort Key: s.created_at DESC
-> HashAggregate (cost=48.81..50.45 rows=94 width=388)
Group Key: s.id
-> Hash Right Join (cost=37.69..48.51 rows=119 width=364)
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=37.40..37.40 rows=23 width=364)
-> Hash Right Join (cost=30.19..37.40 rows=23 width=364)
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=30.11..30.11 rows=6 width=364)
-> Hash Join (cost=16.91..30.11 rows=6 width=364)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..12.94 rows=94 width=364)
-> 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)