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---+Virtuoso SPARQL 1.1. DROP Usage Examples 

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---++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 &lt;urn:sparql:tests:drop:data&gt; :
<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 &lt;urn:sparql:tests:drop:data&gt; 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 &lt;urn:sparql:tests:drop:data&gt; :
<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 &lt;urn:sparql:tests:drop:data&gt; 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]]