About: http://webisa.webdatacommons.org/104332314

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	You have to use an agregate function on auctions.id if you want the query to be valid, such as MIN to retrieve the smallest auctions.id for every product_id group :
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com