An introduction to RDF querying in SPARQL
Identifying graph pattern you don't want
The 'old' way: negation by optionality
What are the movies without a release date?
Be careful with the scope:
What are the movies that were not released in 1997?
What are the movies that were not released in 1997?
Negating with NOT EXISTS
What are the movies without Tom Hanks?
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