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SPARQLSelect—Wolfram Language Documentation

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• See Also
  • SPARQLAsk
  • SPARQLConstruct
  • SPARQLAggregate
  • RDFStore
  • SPARQLExecute
  • RDFTriple
  • SPARQLVariable
  • SPARQLQuery
• Related Guides
  • Graph Store Overview
  • Querying RDF Stores Using SPARQL

SPARQLSelect[pattern]

is a query operator that can be applied to an RDFStore, which returns a list of associations of variables to corresponding values in subgraphs that match pattern.

SPARQLSelect[patternvars]

returns values only for the variables vars.

• SPARQLSelect can be used in SPARQLExecute to query a SPARQL endpoint.
• The result of executing SPARQLSelect[pattern] is a list of associations {<|"var₁"val_1,1,…|>,…} where each "var_i" is the name of a SPARQLVariable appearing in pattern and each val_i,j is the value appearing in the corresponding position of a matching subgraph.
• In SPARQLSelect[pattern], pattern can be any of the following forms:
• RDFTriple[s,p,o] triple pattern {RDFTriple[…],RDFTriple[…],…} basic graph pattern {patt₁,patt₂,…} group graph pattern SPARQLFilter[expr] filter solutions of surrounding patterns by expr patt/;expr filter solutions by expr SPARQLOptional[patt] optional pattern patt₁|patt₂|... union pattern Except[patt] eliminate solutions which are compatible with patt SPARQLPropertyPath[…] property path pattern "var"expr bind expression expr to a variable with name "var" SPARQLValues[vars, values] specify values for variables SPARQLSelect[patt] subquery SPARQLGraph[g,patt] match patt agains the graph with name g SPARQLService[url,patt] federate matching patt to the SPARQL endpoint located at url
• In a triple pattern RDFTriple[s,p,o] a SPARQLVariable stands for any expression.
• The following options can be given:
• "Distinct" False whether duplicate solutions are deleted "Limit" Infinity maximum numer of solutions to return "Offset" 0 number of solutions to skip "OrderBy" None expression by which solutions are ordered "Reduced" False whether duplicate solutions can be deleted

Data about fruits:

Find the color of fruits:

Find the color and the shape of fruits:

Find formulas (P274) and the Japanese name of chemicals (Q11173) containing (P527) calcium (Q706) in Wikidata:

Example data:

A triple pattern is a triple that can contain variables:

Variables can appear in any position:

A triple pattern does not need to contain any variables:

Data about articles:

A basic graph pattern is a list of triple patterns. Retrieve "title" and "created" of all articles:

Variables and literals can appear in any position. Find authors of articles created in 2018:

Different triple patterns in a basic graph pattern are not required to match different triples in a graph. The following contains solutions binding "art1" and "art2" to the same article:

To find authors that have published more than one article filter the solution by requiring "art1" and "art2" to be different:

Data about books:

Books published before 1820:

Data about people:

Find the name and optionally the e-mail address of all people:

When the SPARQLOptional wrapper is omitted the solution for "Bob" is missing:

Data about things, using different "name" properties:

Find the "name" of all things:

The same query using a property path:

Data about people:

Find people without e-mail address:

In this case a query based on NOT EXISTS gives the same result:

Family data:

Find descendents of Johann:

Find only grandchildren:

Data about food products:

Look up the price including delivery fee:

The same query using a "select expression":

Filter products by total price:

Look up the price for certain products:

Data about salaries:

Find the average salary:

The average salary by department:

Filter the groups by the total department salary:

Order by decreasing average salary:

Make a Graph of parent taxons (P171) of the Whale (Q42196) using Wikidata:

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