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v4.5
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    v4.5

      Fonctions de Base de Données

      Exemple de Graph

      Les exemples suivants sont exécutés sur ce graph :

      cardinality()

      Retourne le nombre d'éléments dans une collection. Cette fonction s'applique aux valeurs de types construits.

      Syntaxe cardinality(<expr>)
      Arguments Nom Type Description
      <expr> PATH, LIST, Record L'expression d'entrée
      Type de Retour UINT

      MATCH p = ()->{1,3}()
      RETURN p, cardinality(p)
      

      Résultat :

      p
      cardinality(p)
      (:Paper {_id: "P1", score: 6, title: "Efficient Graph Search", author: "Alex"})-[:Cites {weight: 2}]->(:Paper {_id: "P2", score: 9, title: "Optimizing Queries", author: "Alex"})-[:Cites {weight: 1]->(:Paper {_id: "P3", score: 7, title: "Path Patterns", author: "Zack"}) 5
      (:Paper {_id: "P1", score: 6, title: "Efficient Graph Search", author: "Alex"})-[:Cites {weight: 2]->(:Paper {_id: "P2", score: 9, title: "Optimizing Queries", author: "Alex"}) 3
      (:Paper {_id: "P2", score: 9, title: "Optimizing Queries", author: "Alex"})-[:Cites {weight: 1]->(:Paper {_id: "P3", score: 7, title: "Path Patterns", author: "Zack"}) 3

      LET myList = [1, 2, null, 3]
      RETURN cardinality(myList)
      

      Résultat :

      cardinality(myList)
      4

      LET rec = RECORD{no: 1, value: "tennis"}
      RETURN cardinality(rec)
      

      Résultat :

      cardinality(rec)
      2

      element_id()

      Obtient l'identifiant unique _uuid d'un élément de graph.

      Syntaxe element_id(<elemVar>)
      Arguments Nom Type Description
      <elemVar> NODE, EDGE Référence de la variable d'élément
      Type de Retour UINT64

      MATCH (n)-[e]->()
      RETURN element_id(n), element_id(e)
      

      Résultat :

      element_id(n) element_id(e)
      8718971077612535810 1
      8791028671650463745 2

      labels()

      Obtient le label d'un élément de graph.

      Syntaxe labels(<elemVar>)
      Arguments Nom Type Description
      <elemVar> NODE, EDGE Référence de la variable d'élément
      Type de Retour STRING

      MATCH (n)-[e]->()
      RETURN labels(n), labels(e)
      

      Résultat :

      labels(n) labels(e)
      Paper Cites
      Paper Cites
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