QUERY PLAN
Aggregate (cost=46.35..46.36 rows=1 width=8)
-> Sort (cost=44.97..45.20 rows=92 width=218)
Sort Key: s.created_at DESC
-> HashAggregate (cost=41.05..41.97 rows=92 width=218)
Group Key: s.id
-> Hash Right Join (cost=29.72..40.72 rows=135 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=29.39..29.39 rows=26 width=12)
-> Hash Right Join (cost=22.17..29.39 rows=26 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=22.10..22.10 rows=6 width=12)
-> Hash Join (cost=16.93..22.10 rows=6 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=10 width=4)
-> Seq Scan on tbl_users u (cost=0.00..16.80 rows=10 width=4)
Filter: (department_id = 4)