QUERY PLAN
Aggregate (cost=50.54..50.55 rows=1 width=8)
-> Sort (cost=49.73..49.87 rows=54 width=218)
Sort Key: s.created_at DESC
-> HashAggregate (cost=47.64..48.18 rows=54 width=218)
Group Key: s.id
-> Hash Right Join (cost=37.34..47.50 rows=54 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=37.22..37.22 rows=10 width=12)
-> Hash Right Join (cost=30.06..37.22 rows=10 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=30.02..30.02 rows=3 width=12)
-> Hash Join (cost=16.85..30.02 rows=3 width=12)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..12.92 rows=92 width=20)
-> 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)