SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/material> <http://dbpedia.org/resource/Concrete> . ?x <http://dbpedia.org/ontology/builder> ?uri . }
How many companies have built concrete bridges?
SELECT DISTINCT COUNT ( ?u ) WHERE { ?n property:material resource:Concrete . ?n property:builder ?u . }
10
There are [10] companies who built bridges with concrete material.
[10] companies have built concrete bridges.