Query on relationships with Cypher

Neo4j Graph Platform Graph Algorithms/Graph Data Science
1

Hi. I'm learning neo4j and I have to make a simple query, but I'm not able to make it.
Suppose to have the graph below.
I want to return all the nodes connected to the node A
and the maximum of the values on the edges between two consecutive nodes(which is an attribute of the relation). I show an example in the picture below.

I did it for path of length one with this query:

MATCH (p {id:"A"})<-[r:HAS]-(t)
RETURN p,max(r.value),t

But I don't know how to make a query for a path longer than one, just because I can't do

MATCH (p {id:"A"})<-[r:HAS*]-(t)
RETURN p,max(r.value),t

I got this error : Type mismatch: expected Map, Node, Relationship, Point, Duration, Date, Time, LocalTime, LocalDateTime or DateTime but was List
query
query1

3

Hello Cobra.
Thank you for your reply.
It gives me this error
"Can't use aggregate functions inside of aggregate functions. "

5

Yeah I have APOC. But this leads me to the same error I have reported in the question:
"Type mismatch: expected Map, Node, Relationship, Point, Duration, Date, Time, LocalTime, LocalDateTime or DateTime but was List<Relationship"

6

Hello @AjejeBrazorf and welcome to the Neo4j community :slight_smile:

Sorry, new syntax, I always forget about it.

MATCH path=(a {id:"A"})<-[:HAS*]-(b)
RETURN a,b, max([r in relationships(path) | r.value])

Regards,
Cobra

1 Like
7

Thanks a lot. This perfectly works!
Thanks for your time.

Regards
Ajeje

1 Like