Imagine that two nodes, (:USER {name: "John"}) and (:AGE {name: "28"}), exist. Now, the following query is ok with Neo4j MATCH (u:USER {name: "John"}) MATCH (a:AGE {name: "28"}) MERGE (u)-[:IS]-&g...

I'm trying to create (action)->(state) pair in such a way so that if : the action exists, use it, instead of creating new one the state exists, use it, instead of creating new one and do it in ...