Question

同时使用Create Unique和WHERE IN的正确方法是什么？或者更常见的是如何使用Create Unique从一系列道具中创建所需数量的路径？

我尝试过没有成功：

MATCH (node1) WHERE node1.name = "node1"
CREATE UNIQUE (node1)-[r:`is_tagged`]->(node2:Tag)
WHERE node2.name IN ["Tag1","Tag2"] 
RETURN r

我正在跳这个密码＆＃34;标记＆＃34;节点＆＃34; node1＆＃34;标签＆＃34; Tag1＆＃34;和＆＃34; Tag2＆＃34;。

Answer 1

create constraint on :Tag(name);

MATCH (node1:Document) WHERE node1.name = "node1"
FOREACH (t in ["Tag1","Tag2"] |
 MERGE (node2:Tag {name:t})
 CREATE|MERGE (node1)-[:is_tagged]->(node2)
);

或放松

MATCH (node1:Document) WHERE node1.name = "node1"
UNWIND ["Tag1","Tag2"] as t
MERGE (node2:Tag {name:t})
CREATE|MERGE (node1)-[r:is_tagged]->(node2)
RETURN r

Answer 2

您应首先匹配Tag，然后添加关系：

MATCH (node1) WHERE node1.name = "node1"
WITH node1
MATCH (node2:Tag) WHERE node2.name IN ["Tag1","Tag2"]
CREATE UNIQUE node1-[:is_tagged]->node2

Neo4j创造独特+在哪里

2 个答案: