How to find relationships of 2 types of nodes in Neo4j?

0
votes

I have two types of nodes stored in Neo4j db: Person and Group. I defined a relationship "IN" between Person and Group: (p:Person)-[:IN]->(g:Group).

The question is given 2 Person nodes, how can I find the relationships between them?

I know I can use Cypher queries such as 

MATCH (p1:Person{pid: '11231'})-[:IN]->(g:Group)<-[:IN]-(p2:Person{pid: '1231231'}) 
RETURN p1,p2,g;

But how can I describe a multi-hop relationship so that Neo4j can find links between two not directly linked Person nodes? I don't know how many hops are required to link these two Person nodes.

1
neo4j

1 Answers

1
votes

You can use below Cypher query:

MATCH (p1:Person{pid: '11231'})-[:IN*]-(p2:Person{pid: '1231231'}) return p1,p2;

Note: the * in the relationship IN does the trick.

However, this is inefficient approach and you should limit the number of hops like this:

MATCH (p1:Person{pid: '11231'})-[:IN*1..5]-(p2:Person{pid: '1231231'}) return p1,p2;

More relationship match pattern can be found in the cypher refcard patterns section

https://neo4j.com/docs/cypher-refcard/current/