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Graph database client.

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        MERGE
        Create missing graph data
      
      
        The MERGE clause ensures that an expected pattern exists in the graph, reconciling
          whether data was found, or needs to be created through sub-clauses ON CREATE and ON MATCH.
        
        
          
            Reference:
            MERGE ON CREATE ON MATCH
          
          
            Related:
            :help MATCH :help CREATE :help Cypher
          
        
      
    
    
      
        
          MERGE (charlie:Person { name:'Charlie Sheen', age:10 })
RETURN charlie
          Look for a person named Charlie Sheen, age 10. If not found, create such a person.

Reference:	`MERGE` `ON CREATE` `ON MATCH`
Related:	:help MATCH :help CREATE :help Cypher