Question

I am trying to find the nodes connected that are connected by the relationships having a given label and a given attribute.

For example I want to find all nodes connected by a relationship Edge having as myID 123

I started from this query that returns the data on the relationships.

MATCH ()-[r:Edge{myID: "123"}]->()RETURN r;

Counting these relationships with

MATCH ()-[r:Edge{myID: "123"}]->()RETURN count(r)

I get 45.

I then created the following:

MATCH (a)-[r:Edge{myID: "123"}]->(b)RETURN a,b,r LIMIT 25

However this is not working: it seems to return much more nodes than expected: first of all LIMIT is not limiting and hence the subgraph becomes very big and difficult to analyze but it seems that it is returning even nodes-relationship with a myID property different than 123, for sure more than 45.

How can I do that?

Answer 1

如果使用neo4j浏览器输入查询并可视化结果，则应注意浏览器的“连接结果节点”选项。启用该选项后，浏览器会自动查询（并显示）Cypher查询返回的节点之间的关系。（请注意，返回的关系引用了2个节点。）

您可以通过单击浏览器窗口左侧的齿轮图标，滚动到“浏览器设置”面板的底部，并选中/取消选中“连接结果节点”框，来启用/禁用“连接结果节点”选项。

Answer 2

默认情况下，Neo4J浏览器尝试扩展返回节点时在视图中显示的节点。

可以请您尝试

MATCH p =（a）-[r：Edge {myID：“ 123”}]->（b）返回p限制25。

Neo4J浏览器现在不应该尝试扩展节点。

Neo4j return nodes connected by relationships of a given label and property

2 个答案: