apoc.node.relationship.exists

Function

apoc.node.relationship.exists(node Node, relTypes String) - returns a boolean based on whether the given node has a relationship (or whether the given node has a relationship of the given type and direction).

Signature

apoc.node.relationship.exists(node :: NODE?, types =  :: STRING?) :: (BOOLEAN?)

Input parameters

Name Type Default

node

NODE?

null

types

STRING?

Usage Examples

The examples in this section are based on the following sample graph:

MERGE (michael:Person {name: "Michael"})
WITH michael
CALL {
    WITH michael
    UNWIND range(0, 100) AS id
    MERGE (p:Person {name: "Person" + id})
    MERGE (michael)-[:KNOWS]-(p)
    RETURN count(*) AS friends
}

CALL {
    WITH michael
    UNWIND range(0, 50) AS id
    MERGE (p:Person {name: "Person" + id})
    MERGE (michael)-[:FOLLOWS]-(p)
    RETURN count(*) AS follows
}

RETURN friends, follows;
Table 1. Results
friends follows

101

51

 
MATCH (p1:Person {name: "Michael"})
RETURN apoc.node.relationship.exists(p1) AS output;
Table 2. Results
output

TRUE

 
MATCH (p1:Person {name: "Person40"})
RETURN apoc.node.relationship.exists(p1, "FOLLOWS>") AS output;
Table 3. Results
output

FALSE

 
MATCH (p1:Person {name: "Person40"})
RETURN apoc.node.relationship.exists(p1, "<FOLLOWS") AS output;
Table 4. Results
output

TRUE

More documentation of apoc.node.relationship.exists