QUERY PLAN
Update on tbl_purchase_contract_product_rels (cost=0.28..8.29 rows=1 width=69)
-> Index Scan using tbl_purchase_contract_product_rels_pkey on tbl_purchase_contract_product_rels (cost=0.28..8.29 rows=1 width=69)
Index Cond: (id = 400)