QUERY PLAN
Aggregate (cost=43.59..43.60 rows=1 width=8)
-> Sort (cost=42.58..42.75 rows=67 width=218)
Sort Key: s.created_at DESC
-> HashAggregate (cost=39.88..40.55 rows=67 width=218)
Group Key: s.id
-> Hash Right Join (cost=29.39..39.71 rows=67 width=12)
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=29.23..29.23 rows=13 width=12)
-> Hash Right Join (cost=22.07..29.23 rows=13 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=22.04..22.04 rows=3 width=12)
-> Hash Join (cost=16.86..22.04 rows=3 width=12)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..4.92 rows=92 width=20)
-> Hash (cost=16.80..16.80 rows=5 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=5 width=4)
Filter: (department_id = 8)