What is {safety classification and labelling} of {sodium hydroxide} that is {NFPA Health} is {2} ?
For sodium hydroxide, which has NFPA Health rating 2, what is the safety classification and labeling?
What is the safety classification and labelling of sodium hydroxide that is NFPA Health rating 2?
SELECT ?i WHERE { FILTER ( ?j = 2 ) . resource:sodium_hydroxide property:safety_classification_and_labelling ?o . ?o property:safety_classification_and_labelling ?i . ?o property:NFPA_Health ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q102769> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4952> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P993> <2>
} 

SELECT ?obj WHERE { wd:Q102769 p:P4952 ?s . ?s ps:P4952 ?obj . ?s pq:P993 ?x filter(contains(?x , '2')) }