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I am trying to practice myself in writing some SPARQL queries. Does anybody know where I can find the best material? Where I can find some RDF file and some tasks to try to write my own SPARQL queries. I am good with SQL, and I just need some material to learn to write in SPARQL.
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data.gov and DataHub have a lot of downloadable RDF data sets. If a public SPARQL endpoint is available, DataHub usually lists it. For example: the Rijksmuseum page offers RDF downloads and a link to the endpoint.
My Experiment has a tutorial with examples and a working endpoint.
If you download Jena, you get their example RDF files and SPARQL queries.
Uniprot has a SPARQL endpoint with examples. The RDF is available for download. some of the files are quite large.
There's a large number of downloadable ontologies in RDF format at the OBO Foundry.
Watch this: Probe the Semantic Web with SPARQL
SPARQL Cheat Sheet Slide Deck
As mentioned above: the website for Bob DuCharme's excellent Learning SPARQL Book
All sample RDF and queries from the O'Reilly book "Learning SPARQL" are available on the book's home page at learningsparql.com. (Full disclosure: I wrote it.)