Virtuoso SPARQL 1.1. NOT EXISTS and MINUS

What?

This guide contains Virtuoso SPARQL 1.1. NOT EXISTS and MINUS Usage example 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?

NOT EXISTS and MINUS give a flexible way of check for an absence of a given pattern or exclude possible solutions.

How?

Here are some examples showcasing Virtuoso's support for this functionality:

NOT EXISTS

#  Basic usage
SELECT COUNT(*) 
WHERE 
  {
    ?s ?p "Novosibirsk"  FILTER NOT EXISTS { ?s ?p "???????????" } 
  }

• View the SPARQL Query Definition via SPARQL Protocol URL
• View the SPARQL Query Results via SPARQL Protocol URL

MINUS

SELECT COUNT(*) 
WHERE 
  { 
    { ?s ?p "Novosibirsk" } MINUS { ?s ?p "???????????" }
  }

• View the SPARQL Query Definition via SPARQL Protocol URL
• View the SPARQL Query Results via SPARQL Protocol URL

Related

• SPARQL 1.1. -- Relationship and differences between NOT EXISTS and MINUS
• Virtuoso Tips and Tricks Collection
• Virtuoso SPARQL 1.1 Usage Examples Collection
• Virtuoso SPARQL 1.1 Syntax Tutorial