What is the {grinder model} with the {MIN(sound power level)} whose {subclass of} is {grinding machine}  ?
In the subclass of grinding machine, which grinder model has the quietest power level?
What is the grinder model with the lowest sound power level whose subclass of is grinding machine?
SELECT ?n WHERE { ?n rdf:type ontology:grinding_machine . ?n property:sound_power_level ?s . ?n rdf:type ontology:grinder_model }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q23811263>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2797>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P279> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q245761> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q23811263 . ?ent wdt:P2797 ?obj . ?ent wdt:P279 wd:Q245761} ORDER BY ASC(?obj)LIMIT 5 
Ryobi AG451 Ryobi AG401 Hitachi G12SE2 Hitachi G12SR2 Makita 9557PB