Neo4J - Get all paths without a repeating relationship type or node label

Neo4j Graph Platform Cypher
1

How can I write cypher query to return the whole graph? to get all paths without a repeating relationship type or node label ?

2

You generally would not do this. How big is your graph? Is this just for educational purposes?

What specifically do you want returned?

3

Thanks for responding. I would like to return all nodes and edges only once. For example if I have 450 patient nodes. I only would like to return one patient node label. To show the whole graph, how the nodes are connected to the edges. Is it possible with a cypher query?

I have the below numbers of nodes and edges .
image

I found this answer

MATCH path = (A)-[*]->(B)
UNWIND nodes(path) AS n
UNWIND relationships(path) AS r
WITH 
  collect(DISTINCT path) as paths,
  collect(DISTINCT n) AS nodes, 
  collect(DISTINCT r) AS rels
RETURN
  [p IN paths | {
    nodes: [n IN nodes(p) | id(n)],
    rels: [r IN relationships(p) | id(r)]
  }] as paths,
  reduce(acc={}, n IN nodes | apoc.map.setKey(acc, toString(id(n)), n)) as nodes,
  reduce(acc={}, r IN rels | apoc.map.setKey(acc, toString(id(r)), r)) as rels

but I am getting the error Unknown function 'apoc.map.setKey' (line 13, column 31 (offset: 334))

4

You need to install the apoc library, but the query can be written not to need it. I can provide a solution later

1 Like
5

You wrote

if I have 450 patient nodes. I only would like to return one patient node label.

That sounds to me like you are trying to show the graph's schema. There is in-built db.schema.visualization to do just that.

1 Like