QUERY PLAN
Limit (cost=41.84..41.86 rows=10 width=428)
-> Sort (cost=41.84..41.98 rows=58 width=428)
Sort Key: s.created_at DESC
-> HashAggregate (cost=39.57..40.58 rows=58 width=428)
Group Key: s.id
-> Hash Right Join (cost=29.21..39.42 rows=58 width=408)
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=29.09..29.09 rows=10 width=408)
-> Hash Right Join (cost=21.96..29.09 rows=10 width=408)
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=21.93..21.93 rows=2 width=408)
-> Hash Join (cost=16.85..21.93 rows=2 width=408)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..4.85 rows=85 width=408)
-> Hash (cost=16.80..16.80 rows=4 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=4 width=4)
Filter: (department_id = 3)