QUERY PLAN
Group (cost=65.20..65.22 rows=3 width=4)
Group Key: created_by
-> Sort (cost=65.20..65.21 rows=4 width=4)
Sort Key: created_by
-> Seq Scan on tbl_purchase_contracts (cost=0.00..65.16 rows=4 width=4)
Filter: (cost_type = 2)