使用SPARQL确定是否存在特定的三元组

Question

If the data set is:

@prefix dc:   <http://purl.org/dc/elements/1.1/> .
@prefix :     <http://example.org/book/> .
@prefix ns:   <http://example.org/ns#> .

:book1  dc:title  "SPARQL Tutorial" .
:book2  dc:title  "The Semantic Web" .

How do I check that the triple :book1 dc:title "SPARQL Tutorial" . exists?

I can do SELECT ?book where {?book dc:title "SPARQL Tutorial"} but then I have to do post processing to determine if 'book1' was retrieved!

Answer 1

ASK  { ?book dc:title "SPARQL Tutorial" }