apoc.rel.startNode
Function APOC Core
returns startNode for (virtual) relationships
Usage Examples
The examples in this section are based on the following graph:
CREATE (s1:Student {name: 'Priya'})
CREATE (s2:Student {name: 'Joachim'})
CREATE (s3:Student {name: 'Dominic'})
CREATE (s4:Student {name: 'Amir'})
CREATE (s5:Student {name: 'Natasha'})
CREATE (s6:Student {name: 'Elena'})
CREATE (t1:TestScore {score: 87})
CREATE (t2:TestScore {score: 90})
CREATE (t3:TestScore {score: 78})
CREATE (t4:TestScore {score: 84})
CREATE (t5:TestScore {score: 76})
CREATE (t6:TestScore {score: 92})
CREATE (a:Level {level: 'beginner'})
CREATE (b:Level {level: 'intermediate'})
CREATE (c:Level {level: 'advanced'})
MERGE (s1)-[:HAS]->(t1)-[:ASSIGNED_TO]->(b)
MERGE (s2)-[:HAS]->(t2)-[:ASSIGNED_TO]->(c)
MERGE (s3)-[:HAS]->(t3)-[:ASSIGNED_TO]->(a)
MERGE (s4)-[:HAS]->(t4)-[:ASSIGNED_TO]->(b)
MERGE (s5)-[:HAS]->(t5)-[:ASSIGNED_TO]->(a)
MERGE (s6)-[:HAS]->(t6)-[:ASSIGNED_TO]->(c);If we create virtual relationships between students to see which students have the same understanding level of class material, we can use apoc.rel.startNode to return the relationship id of those virtual relationships:
apoc.create.vRelationship Procedure
MATCH (s1:Student)-[:HAS]->(:TestScore)-[:ASSIGNED_TO]->(l:Level)<-[:ASSIGNED_TO]-(:TestScore)<-[:HAS]-(s2:Student)
CALL apoc.create.vRelationship(s1,'SIMILAR_LEVEL',{level: l.level},s2)
YIELD rel
RETURN apoc.rel.startNode(rel) AS startNode;| startNode |
|---|
(:Student {name: "Priya"}) |
(:Student {name: "Joachim"}) |
(:Student {name: "Dominic"}) |
(:Student {name: "Amir"}) |
(:Student {name: "Natasha"}) |
(:Student {name: "Elena"}) |