QUERY PLAN
Aggregate (cost=79.48..79.49 rows=1 width=8)
-> Sort (cost=75.18..75.89 rows=287 width=228)
Sort Key: s.status, s.target_completed_at, s.updated_at DESC
-> HashAggregate (cost=60.59..63.46 rows=287 width=228)
Group Key: s.id, u.id
-> Nested Loop (cost=0.00..59.15 rows=287 width=26)
-> Seq Scan on tbl_users u (cost=0.00..8.16 rows=1 width=4)
Filter: ((id = 1000) AND (department_id = 10))
-> Seq Scan on tbl_tasks s (cost=0.00..48.12 rows=287 width=34)
Filter: ((parent_id IS NULL) AND (head_of = 1000))