QUERY PLAN
Aggregate (cost=1.88..1.89 rows=1 width=8)
-> Sort (cost=1.59..1.64 rows=19 width=338)
Sort Key: tbl_product_units."order", tbl_product_units.updated_at DESC
-> Seq Scan on tbl_product_units (cost=0.00..1.19 rows=19 width=338)