QUERY PLAN
Aggregate (cost=32.73..32.74 rows=1 width=8)
-> Sort (cost=32.68..32.69 rows=3 width=218)
Sort Key: s.created_at DESC
-> HashAggregate (cost=32.63..32.66 rows=3 width=218)
Group Key: s.id
-> Hash Right Join (cost=20.25..32.44 rows=74 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=20.09..20.09 rows=13 width=12)
-> Nested Loop (cost=5.24..20.09 rows=13 width=12)
-> Index Scan using tbl_users_pkey on tbl_users u (cost=0.14..8.16 rows=1 width=4)
Index Cond: (id = 1001)
Filter: (department_id = 4)
-> Hash Right Join (cost=5.10..11.79 rows=13 width=16)
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=5.06..5.06 rows=3 width=20)
-> Seq Scan on tbl_task_groups s (cost=0.00..5.06 rows=3 width=20)
Filter: (head_of = 1001)