About: http://webisa.webdatacommons.org/3800281

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	All aggregate functions except COUNT(*) and GROUPING ignore nulls.
http://www.w3.org/ns/prov#wasQuotedFrom	academictutorials.com