true prefix oplsioc: prefix sioc: prefix foaf: select (?ord+>tpch:orderpriority), count(1) as ?order_count from where { ?ord a tpch:order . { select ?ord count(?li) as ?cnt where { ?li tpch:has_order ?ord . filter ( ?li+>tpch:commitdate < ?li+>tpch:receiptdate ) } } filter ((?ord+>tpch:orderdate >= "1993-07-01"^^xsd:date) && (?ord+>tpch:orderdate < bif:dateadd ("month", 3, "1993-07-01"^^xsd:date)) && (?cnt > 0) ) } order by ?ord+>tpch:orderpriority ]]>http://demo.openlinksw.com/tpchsoft/sparql