true prefix oplsioc: prefix sioc: prefix foaf: select ?c_count, count(1) as ?custdist from where { { select ?cust+>tpch:custkey, count (?ord) as ?c_count where { ?cust a tpch:customer . optional { ?cust tpch:customer_of ?ord filter (!(?ord+>tpch:comment like "%special%requests%")) } } } } order by desc (count(1)) desc (?c_count) ]]>http://demo.openlinksw.com/tpchsoft/sparql