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v5.0
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    English
    v5.0

      LET Value Expression

      The LET value expression allows you to define variables and use them immediately in an expression. It can be used for improving readability and simplifying more complex expressions.

      <let value expression> ::=
       "LET" <let variable definition list> "IN" <value expression> "END"
      
      <let variable definition list> ::=
        <let variable definition> [ { "," <let variable definition> }... ]
      
      <let variable definition> ::= <binding variable> "=" <value expression>
      

      Example Graph

      The following examples run against this graph:

      To create this graph, run the following query against an empty graph:

      INSERT (p1:Paper {_id:'P1', title:'Efficient Graph Search', score:6, author:'Alex', publisher:'PulsePress'}),
             (p2:Paper {_id:'P2', title:'Optimizing Queries', score:9, author:'Alex'}),
             (p3:Paper {_id:'P3', title:'Path Patterns', score:7, author:'Zack', publisher:'BrightLeaf'}),
             (p1)-[:Cites {weight:2}]->(p2),
             (p2)-[:Cites {weight:1}]->(p3)
      

      Examples

      RETURN LET x = 2, y = 1 IN x^2+y END AS result
      

      Result:

      result
      5

      MATCH (n:Paper)
      RETURN n.title, LET plus = 1 IN n.score + plus END AS newScore
      

      Result:

      n.title newScore
      Optimizing Queries 10
      Efficient Graph Search 7
      Path Patterns 8
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