%META:TOPICPARENT{name="VirtTipsAndTricksGuide"}%

---++How to obtain all graphs Example

   1. <b>Using SPARQL Query:</b> The most popular way for obtaining all graphs list, presuming every graph contains at least one triple for some rdf:type of some subject, is to execute the following query:
<verbatim>
SQL> SPARQL
SELECT DISTINCT ?g 
WHERE 
  { 
     GRAPH ?g {?s a ?t}
  }
</verbatim>
   1. <b>Using Virtuoso built-in function:</b>: Another solution is to use the Virtuoso [[http://docs.openlinksw.com/virtuoso/fn_sparql_select_known_graphs.html][DB.DBA.SPARQL_SELECT_KNOWN_GRAPHS]] function:
<verbatim>
SQL> DB.DBA.SPARQL_SELECT_KNOWN_GRAPHS();
GRAPH_IRI
VARCHAR
_______________________________________________________________________________

http://www.openlinksw.com/schemas/virtrdf#
http://localhost:8890/DAV
http://localhost:8890/dataspace
http://localhost:8890/dataspace/inf

4 Rows. -- 14 msec.
</verbatim>


---+++Related
   
   * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]]
   * [[http://docs.openlinksw.com/virtuoso/rdfperformancetuning.html#rdfperfgetallgraphs][Virtuoso Documentation]]