MERGE instead of CREATE for apoc.create.relationship()

问题

The procedure apoc.create.relationship(n1,RelType,{},n2) behaves accordingly to the CREATE statement. If a relationship of type RelType already exists between nodes n1 and n2 apoc.create.relationship() will create a duplicate.

Is there an equivalent version of apoc.create.relationship() that behaves like MERGE?

回答1:

There is a procedure

apoc.merge.relationship()

which takes same parameters as apoc.create.relationship() and should do what you need.

It has been mentioned in this blog post, but it seems to be missing from documentation - see this issue.

来源：https://stackoverflow.com/questions/52273703/merge-instead-of-create-for-apoc-create-relationship