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---+Virtuoso SPARQL 1.1. DROP Usage Examples
%TOC%
---++What?
This guide contains Virtuoso SPARQL 1.1. DROP Usage examples 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?
Use to remove a named graph from the RDF Quad Store.
---++How?
Here are some examples showcasing Virtuoso's support for this functionality:
---+++DROP Example
This example drops named graph identified by the IRI <urn:sparql:tests:drop:data> from the RDF Quad Store.
1 Assume the following Raw Data Representation in Turtle:
<verbatim>
<#book1> <#price> 41 .
<#book2> <#price> 42 .
<#book3> <#price> 43 .
<#book4> <#price> 44 .
</verbatim>
1 Create explicitly a named graph with IRI <urn:sparql:tests:drop:data> :
<verbatim>
CREATE GRAPH <urn:sparql:tests:drop:data>;
</verbatim>
1 Load the sample data:
<verbatim>
INSERT DATA
{
GRAPH <urn:sparql:tests:drop:data>
{
<#book1> <#price> 41 .
<#book2> <#price> 42 .
<#book3> <#price> 43 .
<#book4> <#price> 44 .
}
}
</verbatim>
1 Query graph <urn:sparql:tests:drop:data> data -- should return 4 triples:
<verbatim>
SELECT *
FROM <urn:sparql:tests:drop:data>
WHERE
{
?s ?p ?o
}
</verbatim>
* [[http://bit.ly/10scyxi][View the SPARQL Query Definition via SPARQL Protocol URL]];
* [[http://bit.ly/X8qXRI][View the SPARQL Query Results via SPARQL Protocol URL]]
1 Drop the named graph identified by the IRI <urn:sparql:tests:drop:data> :
<verbatim>
DROP GRAPH <urn:sparql:tests:drop:data>;
</verbatim>
* Note: If the graph is not created explicitly as per above, i.e. the step <code>CREATE GRAPH ..</code> is omitted, in order to drop the graph you need to use <code>SILENT</code> option, which will not signal any errors:
<verbatim>
DROP SILENT GRAPH <urn:sparql:tests:drop:data>;
</verbatim>
1 Query graph <urn:sparql:tests:drop:data> data -- should return no triples:
<verbatim>
SELECT *
FROM <urn:sparql:tests:drop:data>
WHERE
{
?s ?p ?o
}
</verbatim>
* [[http://bit.ly/10scyxi][View the SPARQL Query Definition via SPARQL Protocol URL]];
* [[http://bit.ly/X8qXRI][View the SPARQL Query Results via SPARQL Protocol URL]]
---++Related
* [[http://www.w3.org/TR/2012/PR-sparql11-update-20121108/#drop][SPARQL 1.1 DROP]]
* [[VirtTipsAndTricksGuideRenameGraph][Rename RDF Graph Example]]
* [[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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![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)