[英]neo4j don' display node between two other nodes
1)添加数据:
MERGE (a1:App {name:'app1'})
MERGE (a2:App {name:'app2'})
MERGE (c1:City {name:'London'})
MERGE (c2:City {name:'New York'})
MERGE (a1)-[:INSTALLED_IN]->(c2)
MERGE (a2)-[:INSTALLED_IN]->(c2)
MERGE (a1)-[:USED_FROM]->(c1)
MERGE (a2)-[:USED_FROM]->(c2)
2)现在我们发现城市之间的关系:
MATCH (c1:City)<-[:USED_FROM]-(a:App)-[:INSTALLED_IN]->(c2:City)
RETURN DISTINCT 'City ' + c1.name
+ ' - [:AccessesApplicationIn] -> ' +
'City ' + c2.name
AS AccessesApplicationIn
AccesssApplicationIn :
City New York - [:AccessesApplicationIn] -> City New York
City London - [:AccessesApplicationIn] -> City New York
UPD :
3)查询的另一种选择:
MATCH path=(:City)-[r:AccessesApplicationIn]-(:City) DELETE r
RETURN PATH
UNION
MATCH (c1:City)<-[:USED_FROM]-(a:App)-[:INSTALLED_IN]->(c2:City)
MERGE path=(c1)-[:AccessesApplicationIn]->(c2)
RETURN DISTINCT path
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