QUERY PLAN
Group (cost=88.44..88.44 rows=1 width=4)
Group Key: created_by
-> Sort (cost=88.44..88.44 rows=1 width=4)
Sort Key: created_by
-> Seq Scan on tbl_purchase_contracts (cost=0.00..88.42 rows=1 width=4)
Filter: (cost_type = 2)