Tutorial explaining how the it is possible to nest one query within another query in order to avoid the queries running independently (and thus returning multiple results of the same triples). Shows both the proper syntax for subqueries and explains the rationale (including how they differ from the use of UNION).
URL: https://www.youtube.com/watch?v=olnu2SwQn4U
Keywords: SPARQL
Author: Sadawi, Noureddin
Date created: 2014-03-03 07:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P15M
- Formulates advanced queries using subqueries.
- Interacting with RDF data
- Querying RDF data
- Differentiates between a Default Graph and a Named Graph, and formulates queries using the GRAPH clause.
- Formulates advanced queries using subqueries.
- Formulates advanced queries using subqueries.
- Differentiates between a Default Graph and a Named Graph, and formulates queries using the GRAPH clause.
- Querying RDF data
- Interacting with RDF data
- Uses UNION to formulate queries with multiple possible graph patterns.
- Interacting with RDF data
- Querying RDF data
- Understands how to combine and filter graph patterns using operators such as UNION, OPTIONAL, FILTER, and MINUS.
- Uses UNION to formulate queries with multiple possible graph patterns.
- Uses UNION to formulate queries with multiple possible graph patterns.
- Understands how to combine and filter graph patterns using operators such as UNION, OPTIONAL, FILTER, and MINUS.
- Querying RDF data
- Interacting with RDF data
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