Uses NOT EXISTS to limit whether a given graph pattern exists in the data.
This slide tutorial focuses on using various operators in SPARQL queries. Several examples are provided which include the RDF data being queried, the SPARQL query [...]
This page, which contains SPARQL tools, tips, sample queries, is just starting out and the authors hope it can become a resource for useful snippets [...]
This video serves as an introduction to the W3C query language for RDF, SPARQL. Before explaining SPARQL queries themselves, a brief discussion of Linked Data [...]
Tutorial showing how to modify a query to return instances of data where a specific property does not exist- the FILTER, NOT EXISTS, and MINUS [...]
This is a very in-depth resource that covers nearly every aspect of SPARQL (both 1.0 and 1.1). Includes example queries (over many datasets), links to [...]