Cypher 中的可选匹配和 WHERE

Question

我正在努力编写密码查询。

图表

下图为完整图。有些电影没有特技演员（图表是虚构的）。

问题

我想要所有从未与替身演员一起出演过电影的演员（和他们的电影）。在这种情况下，它将是 "Johnny Depp"

Answer 1

我想这会让你前进

// Find the actors and their movies
MATCH (a:Actor)--(m:Movie)

// where the actor was never in a movie with a stuntman
WHERE NOT (a)-[:ACTS_IN]-(:Movie)-[:ACTS_IN]-(:Stuntman)
RETURN a,m

Answer 2

这应该有效：

MATCH (n:Actor)-->(m:Movie)
WHERE NOT (n)-->()<--(:Stuntman)
RETURN n AS actor, collect(m) AS movies

干杯

PS：还有其他解决方案，但我认为性能较差：

MATCH (n:Actor)-->(m:Movie)
WITH n AS actor, collect(m) AS movies
WHERE all(m IN movies WHERE not (m)<--(:Stuntman))
RETURN actor, movies

Cypher 中的可选匹配和 WHERE

OPTIONAL MATCH and WHERE in Cypher

neo4j

graph-databases

cypher