QUERY PLAN
Aggregate (cost=33.88..33.89 rows=1 width=8)
-> Sort (cost=32.78..32.96 rows=73 width=222)
Sort Key: s.created_at DESC
-> HashAggregate (cost=29.79..30.52 rows=73 width=222)
Group Key: s.id
-> Hash Right Join (cost=19.11..29.61 rows=73 width=12)
Hash Cond: (turs.task_group_id = s.id)
-> Seq Scan on tbl_task_group_user_relationships turs (cost=0.00..7.94 rows=494 width=4)
-> Hash (cost=18.94..18.94 rows=13 width=12)
-> Hash Right Join (cost=14.16..18.94 rows=13 width=12)
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=14.09..14.09 rows=6 width=12)
-> Hash Join (cost=7.92..14.09 rows=6 width=12)
Hash Cond: (s.head_of = u.id)
-> Seq Scan on tbl_task_groups s (cost=0.00..5.91 rows=91 width=20)
-> Hash (cost=7.80..7.80 rows=10 width=4)
-> Seq Scan on tbl_users u (cost=0.00..7.80 rows=10 width=4)
Filter: (department_id = 4)