忽略 Cypher 查询中的属性或替代方法：如何计算关系序列

Question

以下 Cypher 语句为我提供了代码下方的图形输出（见图）。以及图像下方的文本输出。我的问题是文本输出。

我会尽量把问题解释清楚：我对两个节点的相同序列感兴趣，关于特定的属性（此处：personName）。例如。正如您在图片中（或从 create 语句中）看到的那样，Bob 在 May 之后出现了两次。我想通过 apoc.coll.frequencies(pairsOfActs) AS giveBackFrequencyOfPairs 捕获这个 RETURN giveBackFrequencyOfPairs。但是，'time' 属性挡住了路。有没有办法忽略时间属性？我一直在尝试对列表进行操作，还尝试删除时间属性（然后我的序列就消失了），但没有任何效果。有什么建议么？或者这种方法完全错误，或者甚至有一个预定义的函数来计算我缺少的特定节点序列？

CREATE
    (a: Action {personName: 'Tom', time: 1}), 
    (b: Action {personName: 'May', time: 2}),  
    (c: Action {personName: 'Bob', time: 3}),
    (d: Action {personName: 'Alex', time: 4}), 
    (e: Action {personName: 'Zac', time: 5}),
    (f: Action {personName: 'Jill', time: 6}),
    (g: Action {personName: 'May', time: 7}),  
    (h: Action {personName: 'Bob', time: 8})


MATCH (act: Action) 
WITH act  ORDER BY act.time ASC 
WITH COLLECT(act) AS acts 
FOREACH (n IN RANGE(0, size(acts)-2) |
FOREACH (curr IN [acts[n]] | 
FOREACH (next IN [acts[n+1]] | 
MERGE (curr)-[:NEXT]-> (next)))) 
WITH apoc.coll.pairsMin(acts) as pairsOfActs
UNWIND pairsOfActs as unwoundPairsOfActs
WITH apoc.coll.frequencies(unwoundPairsOfActs) AS    giveBackFrequencyOfPairs
RETURN giveBackFrequencyOfPairs

Answer 1

对于您陈述的问题，无需创建 NEXT 关系，因此本答案不会创建它们。如果出于某种原因确实需要，您可以修改此答案以将其添加回去。

此查询应 return 每对名称（出现在您的 time 序列中）的频率：

MATCH (act: Action) 
WITH act ORDER BY act.time ASC 
RETURN apoc.coll.frequencies(apoc.coll.pairsMin(COLLECT(act.personName))) AS giveBackFrequencyOfPairs

带有样本数据的输出将是：

╒══════════════════════════════════════════════════════════════════════╕
│"giveBackFrequencyOfPairs"                                            │
╞══════════════════════════════════════════════════════════════════════╡
│[{"count":1,"item":["Tom","May"]},{"count":2,"item":["May","Bob"]},{"c│
│ount":1,"item":["Bob","Alex"]},{"count":1,"item":["Alex","Zac"]},{"cou│
│nt":1,"item":["Zac","Jill"]},{"count":1,"item":["Jill","May"]}]       │
└──────────────────────────────────────────────────────────────────────┘

忽略 Cypher 查询中的属性或替代方法：如何计算关系序列

Ignoring a property within Cypher Query OR alternative: how count relationship sequences

frequency

sequence

neo4j

cypher

neo4j-apoc

忽略 Cypher 查询中的 属性 或替代方法：如何计算关系序列

Ignoring a property within Cypher Query OR alternative: how count relationship sequences

frequency

sequence

neo4j

cypher

neo4j-apoc

忽略 Cypher 查询中的属性或替代方法：如何计算关系序列