Neo4j - 哪个联邦州在大多数委员会中都有成员？

Question

我是Neo4j的新手，正在学习基础知识。到目前为止，我已经成功地将其结合在一起：

MATCH (l:Legislator)-[:REPRESENTS]->(s:State)
MATCH (l)-[:SERVES_ON]->(c:Committee)
WITH s.code as states, count(c) as committees
return states, committees
order by committees DESC

此查询为我提供了以下输出：

s.code   committees
"CA"     90
"TX"     70
"NY"     51
"FL"     43
"PA"     36
"IL"     35
...      ...

如果我理解正确，输出会告诉我每个Legislator

中所有Committee和所有State个节点之间有多少关系

我如何更改查询以便获取每个州成员所在的唯一委员会的数量？

可输出的东西：

s.code   committees
"NY"     29
"TX"     27
"CA"     25
...      ...

Answer 1

您可以尝试使用distinct：

MATCH (l:Legislator)-[:REPRESENTS]->(s:State) 
MATCH (l)-[:SERVES_ON]->(c:Committee)
WITH s.code as states, count(distinct c) as committees
return states, committees
order by committees DESC