Neo4j密码查询，用于删除除一个子节点外的所有子节点及其关系

Question

I am trying to delete child nodes except one child node.

when I execute this Cypher:

MATCH (n{name:'Java'})-[r]-(c)
return c.name

I am getting possible node names, but I need only longest node name and I have to delete rest of nodes and its relationships.

Answer 1

This query should work:

MATCH (n{name:'Java'})--(c)
WHERE EXISTS(c.name)
WITH c ORDER BY LENGTH(c.name) DESC
SKIP 1
DETACH DELETE c;

It finds all c nodes that have a name property, orders them in descending order by the length of the name value, skips the c node with the longest name, and uses DETACH DELETE to delete the other c nodes and all their relationships.