true prefix oplsioc: prefix sioc: prefix foaf: select ?cust+>foaf:name ?cust ?ord ?ord+>tpch:orderdate ?ord+>tpch:ordertotalprice sum(?li+>tpch:linequantity) from where { ?cust a tpch:customer ; foaf:name ?c_name . ?ord a tpch:order ; tpch:has_customer ?cust . ?li a tpch:lineitem ; tpch:has_order ?ord . { select ?sum_order sum (?li2+>tpch:linequantity) as ?sum_q where { ?li2 a tpch:lineitem ; tpch:has_order ?sum_order . } } . filter (?sum_order = ?ord and ?sum_q > 250) } order by desc (?ord+>tpch:ordertotalprice) ?ord+>tpch:orderdate ]]>http://demo.openlinksw.com/tpchsoft/sparql