QUERY PLAN
Limit (cost=41.75..41.78 rows=10 width=389)
-> Sort (cost=41.75..41.89 rows=54 width=389)
Sort Key: s.created_at DESC
-> HashAggregate (cost=39.64..40.58 rows=54 width=389)
Group Key: s.id
-> Hash Right Join (cost=29.34..39.50 rows=54 width=369)
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=29.22..29.22 rows=10 width=369)
-> Hash Right Join (cost=22.06..29.22 rows=10 width=369)
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=22.02..22.02 rows=3 width=369)
-> Hash Join (cost=16.85..22.02 rows=3 width=369)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..4.92 rows=92 width=369)
-> 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)