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v4.5
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    v4.5

      COALESCE

      L'expression COALESCE est une expression conditionnelle qui renvoie la première valeur non nulle d'une liste d'expressions fournies. Cela est utile pour substituer une valeur par défaut lors de la rencontre de valeurs nulles, en particulier dans les scénarios où vous souhaitez éviter des résultats nuls dans les calculs ou l'affichage.

      <coalesce expression> ::= 
        "COALESCE" "(" <value expression> { "," <value expression> }... ")"
      

      L'expression COALESCE(V1, V2, V3) est équivalente à l'instruction CASE suivante :

      CASE 
        WHEN NOT V1 IS NULL THEN V1
        WHEN NOT V2 IS NULL THEN V2
        ELSE V3
      END
      

      Exemple de Graph

      Les exemples suivants s'exécutent contre ce graph :

      Pour créer ce graph, exécutez la requête suivante contre un graph vide :

      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)
      

      Exemple

      MATCH (n:Paper)
      RETURN n.title, COALESCE(n.publisher, "N/A") AS publisher
      

      Résultat:

      n.title publisher
      Efficient Graph Search PulsePress
      Optimizing Queries N/A
      Path Patterns BrightLeaf
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