true prefix oplsioc: prefix sioc: prefix foaf: select (100 * sum ( bif:equ(bif:LEFT(?part+>tpch:type, 5), "PROMO") * ?li+>tpch:lineextendedprice * (1 - ?li+>tpch:linediscount) ) / sum (?li+>tpch:lineextendedprice * (1 - ?li+>tpch:linediscount)) ) as ?promo_revenue from where { ?li a tpch:lineitem ; tpch:has_part ?part . filter ((?li+>tpch:shipdate >= "1995-09-01"^^xsd:date) && (?li+>tpch:shipdate < bif:dateadd("month", 1, "1995-09-01"^^xsd:date)) ) } ]]>http://demo.openlinksw.com/tpchsoft/sparql