web scraping - Can SPARQL handle blank results for specific cells? -

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i writing sparql query , cant figure out how allow blank results specific columns.

my current request is:

select * { ?game dbpedia-owl:game ; dbpprop:name ?name ;  dbpedia-owl:publisher ?publisher . }

some games have owl publisher while others not. above request filters out games not have publisher. want able games publisher , games without publisher in same csv.

i tried write if isset statements publisher owl cannot seem correct blanks.

instead of filtering out games without publisher, want result blank publisher cell.

any suggestions?

whenever looking might , might not present, can put part of statement in optional part of sparql query. thus:

select * {     ?game dbpedia-owl:game ;     dbpprop:name ?name .  optional{      ?game dbpedia-owl:publisher ?publisher .  } }

the count before optional 112 , after 143.


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