Virtuoso Open-Source Edition

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    • VOS.VirtTipsAndTricksSPARQL11Assign(Last) -- DAVWikiAdmin? , 2017-06-13 05:41:15 Edit
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    WebDAV System Administrator 2017-06-13 05:41:15

    Using SPARQL 1.1 Assignments

    What?

    Using SPARQL 1.1 assignments.

    Why?

    Allows the creation of new values in a query.

    How?

    Here is example showcasing Virtuoso's support for this functionality:

    1. Assume the following Raw Data Representation in Turtle: 

      <#lemonade> <#price> 4 . 
<#wine>     <#price> 6 . 
<#water>    <#price> 1 . 
<#beer>     <#price> 3 . 
<#liqueur>  <#price> 5 .

    2. Load the sample data using SPARQL 1.1. INSERT Syntax: 

      INSERT 
  {
    GRAPH <urn:sparql:tests:assign> 
      { 
        <#lemonade> <#price> 4 . 
        <#wine>     <#price> 6 . 
        <#water>    <#price> 1 . 
        <#beer>     <#price> 3 . 
        <#liqueur>  <#price> 5 . 
      }
  }

    3. Let's assign new price: 

      SELECT ?item (?price*2.3 as ?NewPrice)
FROM <urn:sparql:tests:assign> 
WHERE 
  {
    ?item <#price> ?price 
  }

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