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%META:TOPICPARENT{name="VirtTipsAndTricksSPARQL11FeaturesExamplesCollection"}% ---+Virtuoso SPARQL 1.1. Subqueries Usage Examples ---++What? This guide contains Virtuoso SPARQL 1.1. Subqueries Usage example queries which you can run against any SPARQL endpoint that supports SPARQL 1.1 and the ability to allow a verified user perform INSERT operations. ---++Why? Using subqueries provides good readability. Certain types of problems can be stated more concisely, and more efficiently, with subqueries. ---++How? Here are some examples showcasing Virtuoso's support for this functionality: 1 Assume the following Raw Data Representation in Turtle: <verbatim> <http://people.example/alice> <http://people.example/name> "Alice", "Alice Foo", "A. Foo" . <http://people.example/alice> <http://people.example/knows> <http://people.example/bob> , <http://people.example/carol> . <http://people.example/bob> <http://people.example/name> "Bob", "Bob Bar", "B. Bar" . <http://people.example/carol> <http://people.example/name> "Carol", "Carol Baz", "C. Baz" . </verbatim> 1 Beautified Raw Data Representation in Turtle (from above) using Namespace Prefix: <verbatim> <#alice> <#name> "Alice" . <#alice> <#name> "Alice Foo" . <#alice> <#name> "A. Foo" . <#alice> <http://xmlns.com/foaf/0.1/knows> <#bob>, <#carol> . <#bob> <#name> "Bob" . <#bob> <#name> "Bob Bar" . <#bob> <#name> "B. Bar" . <#carol> <#name> "Carol" . <#carol> <#name> "Carol Baz" . <#carol> <#name> "C. Baz" . </verbatim> 1 Load the sample data: <verbatim> INSERT { GRAPH <urn:sparql:tests:subquery> { <#alice> <#name> "Alice" . <#alice> <#name> "Alice Foo" . <#alice> <#name> "A. Foo" . <#alice> <http://xmlns.com/foaf/0.1/knows> <#bob>, <#carol> . <#bob> <#name> "Bob" . <#bob> <#name> "Bob Bar" . <#bob> <#name> "B. Bar" . <#carol> <#name> "Carol" . <#carol> <#name> "Carol Baz" . <#carol> <#name> "C. Baz" . } } </verbatim> 1 Query the graph data by using a sub-query in the SPARQL query statement: <verbatim> SELECT ?y ?minName WHERE { <#alice> <http://xmlns.com/foaf/0.1/knows> ?y . { SELECT ?y (MIN(?name) AS ?minName) WHERE { ?y <#name> ?name . } GROUP BY ?y } } </verbatim> 1 [[http://bit.ly/YohiXp][View the SPARQL Query Definition via SPARQL Protocol URL]]; 1 [[http://bit.ly/11eCdM5][View the SPARQL Query Results via SPARQL Protocol URL]] ---++Related * [[http://www.w3.org/TR/2010/WD-sparql11-query-20100126/#subqueries][SPARQL 1.1 Subqueries]] * [[http://www.w3.org/TR/rdf-sparql-protocol/][SPARQL Protocol (HTTP based Query Service)]] * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]] * [[VirtTipsAndTricksSPARQL11FeaturesExamplesCollection][Virtuoso SPARQL 1.1 Usage Examples Collection]] * [[http://virtuoso.openlinksw.com/tutorials/sparql/SPARQL_Tutorials_Part_9/SPARQL_Tutorials_Part_9.html][Virtuoso SPARQL 1.1 Syntax Tutorial]] * [[http://docs.openlinksw.com/virtuoso/rdfsparql.html][Virtuoso Documentation]]

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