密码：匹配未通过路径连接的多个节点

Question

I'm having a problem using Neo4j at the moment where I want to match two ore more nodes, that are not connected by any path.

Let's say we have a graph with two context components (is this the right word?), for example 4 nodes (A)-->(B) and (C)-->(D) .

When I run MATCH (A), (C) in this situation, i get "No Rows" as result, probably because the algorithm can't reach (C) after having chosen (A) as starting node.

How can I still match those nodes?

Answer 1

It turns out the problem is caused from something other than Neo4j. I can't recreate it on another computer. The approach to use MATCH (A), (B) was the correct one.

Answer 2

I think you really want MATCH (A) MATCH (C) ... without the comma. This will give you two starting points which you can either RETURN or pass forward with WITH . As Tezra says, using the comma will create a cartesian product.