Neo4j：如何使用DELETE子句返回UNION返回的结果？

Question

如何在下面的语句中执行DELETE子句？

MATCH (u:User {userId:'ce5e59de-af34-4dba-a134-8ff1de3696b6'})-[r:WRITE*..2]-(p) 
RETURN u,r,p 
UNION MATCH (u:User {userId:'ce5e59de-af34-4dba-a134-8ff1de3696b6'})-[r:COMMENT]-(p) 
RETURN u,r,p

Answer 1

您无法在已撰写的查询中添加DELETE，但您可以不同方式编写，以便独立删除每个步骤：

MATCH (u:User {userId:'ce5e59de-af34-4dba-a134-8ff1de3696b6'})
OPTIONAL MATCH (u)-[:WRITE*..2]-(p)
DETACH DELETE p
WITH DISTINCT u
OPTIONAL MATCH (u)-[:COMMENT]-(p)
DETACH DELETE u, p