QUERY PLAN
Limit (cost=157.59..157.60 rows=1 width=252)
-> Sort (cost=157.59..157.60 rows=1 width=252)
Sort Key: s.created_at DESC
-> Group (cost=157.57..157.58 rows=1 width=252)
Group Key: s.id, u.id
-> Sort (cost=157.57..157.58 rows=1 width=252)
Sort Key: s.id, u.id
-> Nested Loop Left Join (cost=0.00..157.56 rows=1 width=252)
Join Filter: (u.id = s.head_of)
-> Seq Scan on tbl_tasks s (cost=0.00..149.79 rows=1 width=248)
Filter: ((head_of = 1001) AND (status = 0))
-> Seq Scan on tbl_users u (cost=0.00..7.76 rows=1 width=4)
Filter: (id = 1001)