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v5.0
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    v5.0

      Predicate Functions

      Example Graph

      The following examples run against this graph:

      all_different()

      Determines whether all graph elements bound to a list of element variables are pairwise different from one another.

      Syntax all_different(<elemVar_1>, <elemVar_2>,...)
      Arguments Name Type Description
      <elemVar_N> NODE or EDGE Node or edge variable reference
      Return Type UINT

      MATCH (n1 {_id:"P1"})
      MATCH ({_id:"P1"})-(n2)
      MATCH ({_id:"P3"})-(n3)
      RETURN table(n1._id, n2._id, n3._id, all_different(n1, n2, n3))
      

      Result:

      n1._id n2._id n3._id
      all_different(n1, n2, n3)
      P1 P2 P2 0

      property_exists()

      Determines if a referenced graph element has a property.

      Syntax property_exists(<elemVar>, <propName>)
      Arguments Name Type Description
      <propName> NODE or EDGE Node or edge variable reference
      <elemVar> STRING Property name
      Return Type UINT

      MATCH (n:Paper) LIMIT 1
      RETURN PROPERTY_EXISTS(n, "name")
      

      Result:

      PROPERTY_EXISTS(n, "name")
      0

      same()

      Determines whether all element variables bind to the same graph element.

      Syntax same(<elemVar_1>, <elemVar_2>,...)
      Arguments Name Type Description
      <elemVar_N> NODE or EDGE Node or edge variable reference
      Return Type UINT

      MATCH ({_id:"P1"})-(n1)
      MATCH ({_id:"P3"})-(n2)
      RETURN table(n1._id, n2._id, same(n1, n2))
      

      Result:

      n1._id n2._id same(n1, n2)
      P2 P2 1
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