QUERY PLAN
Aggregate (cost=55.77..55.78 rows=1 width=8)
-> Sort (cost=55.62..55.65 rows=10 width=228)
Sort Key: s.target_completed_at, s.updated_at DESC
-> Group (cost=55.38..55.46 rows=10 width=228)
Group Key: s.id, u.id
-> Sort (cost=55.38..55.41 rows=10 width=26)
Sort Key: s.id, u.id
-> Nested Loop Left Join (cost=0.14..55.22 rows=10 width=26)
Join Filter: (u.id = s.head_of)
-> Seq Scan on tbl_tasks s (cost=0.00..50.90 rows=10 width=34)
Filter: ((parent_id IS NULL) AND (head_of = 1000) AND (status = '0'::smallint))
-> Materialize (cost=0.14..4.17 rows=1 width=4)
-> Index Only Scan using tbl_users_pkey on tbl_users u (cost=0.14..4.16 rows=1 width=4)
Index Cond: (id = 1000)