how to create relationship and merge/create new node in loop in neo4j

问题

I am trying to create friend relationship to all the ids in the list but I am getting an error:

y already declared (line 2, column 41 (offset: 64))

"Merge (y:User{id:"21",name:"b"})
 Merge (y:User{id:"41",name:"d"})
 Merge (y:User{id:"51",name:"e"}) "
                                         ^
 Neo.ClientError.Statement.InvalidSyntax

I am trying to create a new user with id,name,year and also relationship with existing node at the same time .How can I do it ?Is there any other way also?I really appreciate any help.

MATCH (u:User {id:"2"})
Merge (y:User{id:"21",name:"b",year:"2010"})
Merge (y:User{id:"41",name:"d",year:"2011"})
Merge (y:User{id:"51",name:"e",,year:"2013"}) 
MERGE (u)-[:FRIEND]->(y)

回答1:

Reusing identifier y won't work.

Try

MATCH (u:User {id:"2"})
unwind [{id:"21",name:"b",year:"2010"},
        {id:"41",name:"d",year:"2011"},
        {id:"51",name:"e",year:"2013"}] as user
merge (y:User {id: user.id, name: user.name,year:user.year})
MERGE (u)-[:FRIEND]->(y)

来源：https://stackoverflow.com/questions/30208963/how-to-create-relationship-and-merge-create-new-node-in-loop-in-neo4j