About: http://webisa.webdatacommons.org/341843283

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	SQL's specification of GROUP BY and related aggregate operators has some flaws, especially with respect to handling of empty sets and NULLs, but the underlying concept is sound.
http://www.w3.org/ns/prov#wasQuotedFrom	c2.com