密码查询:如何在Agensgraph和SAP HANA中计算余弦相似性

Question

我想使用密码测试GraphDB之间的简单图分析性能。

我引用了这个网站，并在Neo4j，Agensgraph，SAP HANA和Redis中重现了这个例子。

但是密码查询(见下文(不在Agensgraph和SAP HANA中运行。

MATCH (p1:Person {name:'Michael Sherman'})-[r1:RATED]->(m:Movie)<-[r2:RATED]-(p2:Person {name:'Michael Hunger'}) RETURN m.name AS Movie, r1.rating AS `M. Sherman's Rating`, r2.rating AS `M. Hunger's Rating`

我认为第二个箭头模式在Agensgraph和SAP HANA中不起作用。

如何编辑此查询以在 Agensgraph 和 SAP HANA 中操作？

Answer 1

我已经解决了由查询语言语法差异引起的类似问题。

这是我的查询，用于找出AgesnGraph中的相似性。您将能够通过很少的修改来计算余弦相似性。

MATCH (u1:users {userid:'Toby'})-[r1:hasrated]->(m:movies)<-[r2:hasrated]-(u2:users) 
WITH distinct u1.userid as u1name, u2.userid as u2name, 
SUM(r1.rating::float*r2.rating::float) as xyDotProduct, 
SQRT(SUM(r1.rating::float^2)) as xLength, 
SQRT(SUM(r2.rating::float^2)) as yLength 
RETURN u1name, u2name, xyDotProduct::float/(xLength::float*yLength::float) as similarity;