QUERY PLAN
Limit (cost=37.79..37.81 rows=8 width=384)
-> Sort (cost=37.79..37.81 rows=8 width=384)
Sort Key: s.created_at DESC
-> HashAggregate (cost=37.53..37.67 rows=8 width=384)
Group Key: s.id
-> Hash Right Join (cost=26.26..37.32 rows=84 width=364)
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=26.06..26.06 rows=16 width=364)
-> Nested Loop (cost=13.42..26.06 rows=16 width=364)
-> 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=13.28..17.73 rows=16 width=364)
Hash Cond: (thrs.task_group_id = s.id)
-> Seq Scan on tbl_task_group_head_of_relationships thrs (cost=0.00..3.93 rows=193 width=4)
-> Hash (cost=13.18..13.18 rows=8 width=364)
-> Seq Scan on tbl_task_groups s (cost=0.00..13.18 rows=8 width=364)
Filter: (head_of = 1001)