Neo4J：在Cypher中来回连接

Question

I have the following Nodes in a Neo4J DB (Northwind DB):

• Customer
• Order
• Product

The nodes have the following relationship:
(c:Customer)-->(o:Order)--> (p:Product)

How can I get the Products , and the count of the products, that have been bought by Customers , who also bought a Product with pr_ID =2?

I have tried the following query. It returns the correct items, but the wrong counts:

MATCH (p:Product)<--(o:Order)<--(c:Customer) 
WITH p,o,c WHERE p.productID='2' 
MATCH c-->(od:Order)-->(pr:Product) 
WITH c,od,pr WHERE NOT pr.productID='2' 
RETURN pr.productName, count(pr.productName)

Answer 1

you need to filter the product id before passing them with the WITH :

MATCH (c:Customer)-->(o:Order)-->(p:Product {productId: '2'})
MATCH (c)-->(:Order)-->(p2:Product)
WHERE p2 <> p
RETURN p2.productName, count(*) as c

Answer 2

我的查询不起作用的原因是，我使用了count(pr.productName)而不是count(DISTINCT od) 。