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An introduction to RDF querying in SPARQL

Zwifi
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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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