Re: [Neo4j] Primary keys with NEO4J?

[Jim Webber]

Hi Rodger,

> Does NEO4J support primary keys, or unique indexes at all?

You can give any node or relationship a key that you consider to be primary.

> So that, you don't insert a node twice?

Yes, there's unique creation:

http://docs.neo4j.org/chunked/stable/transactions-unique-nodes.html

It's surfaced in Cypher:

http://docs.neo4j.org/chunked/milestone/query-create-unique.html

Jim

[Rodger]

Hello Jim, 

Thanks for responding. 

At:

http://docs.neo4j.org/chunked/milestone/query-create-unique.html

CREATE UNIQUE only works for distinct relationships, correct?

Is there a similar functionality to only create unique nodes, no duplicates?

ie. a person only exists in one node in the entire graph database, but has any number of relationships?

At:

http://docs.neo4j.org/chunked/stable/transactions-unique-nodes.html

UniqueFactory and putIfAbsent can only be done via java, correct?

Does the same functionality exist in Cypher?

Thanks a lot!