为什么重复结果查询 cypher neo4j

Question

I am implementing the example database Movies en Neo4j. I already search something about duplicated rows but I still have doubts

I am using XOR . I am getting the

MATCH (m:Movie)<-[r]-(p:Person)
WHERE m.title STARTS WITH 'The' 
XOR (m.released = 1999 OR m.released = 2003)
RETURN m.title, m.released
So, my result is

As you can see, there are duplicated rows, I don't understand why there are doing that and the number of duplicated results is according to what?

I know that DISTINCT removes duplicated. But I am interested in understanding why the query duplicated the results and the number of duplicated is according to what?.

Answer 1

This is because you are matching

MATCH (m:Movie)<-[r]-(p:Person)

So the movie title will be returned for each person in the movie, so if there are 4 people in the movie, you will get four movie titles back. You can remove duplicates by matching only the movie

MATCH (m:Movie)

Answer 2

As Tomaz said, it is returning a row for every:Person that has a relationship to:Movie. If you concluded your query with just RETURN m and viewed the results, you probably would only see non-duplicated nodes appear. Otherwise, you can conclude the query with RETURN DISTINCT m to ensure that non-duplicated results are returned.