从列计算百分比是表neo4j/Cypher

Question

我想计算每种职业的每种技能的百分比。 我做了a有不同的节点占用和Soft_skills它们有关系[r:MAPS_TO]该关系有两个属性类型（'essentieel'，'optioneel'）和b（这种权重essentieel = 1.0和optioneel = 0.5）

请参阅下面我正在使用的文件的示例

职业	代码_职业	技能代码	名字	类型	b
博士	sk_565	sk_687	勒伦	选项	0.5
博士	sk_565	sk_687	勒伦	选项	0.5
博士	sk_565	sk_687	勒伦	精华	1.0
博士	sk_565	sk_687	勒伦	精华	1.0

我做了一个查询，我可以计算每个职业的总和，请参阅下面的查询：

match (b:BOC_beroep)-[r:MAPS_TO]-(s:Soft_Skill)                                                     
return b.beroepstitel as beroep,                             
sum(toFloat(r.b)) as sum order by sum desc                         
limit 10

这是我的输出

贝罗普	总和
多克	5
卡珀	7

知道我想要达到我计算的技能类型的百分比

Dokter have in total 4 skills en the percentage of each skill is 
2/4 * 100 = 50% essentieel 
1/4 * 100 = 25% optioneel 

i was trying to make a new calculation with this query:

  MATCH (b:BOC_beroep)-[r:MAPS_TO]->(s:Soft_skill)
  WITH SUM(toFloat(r.b)) As total
  MATCH (b:BOC_beroep)-[r:MAPS_TO]->(s:Soft_Skill)
  RETURN b.beroepstitel  AS beroep, 
  (toFloat(total/(r.b)))*100 AS percent
  order by percent desc

我的输出是 Cannot split 'Long' by 'string' 我不明白这个错误

我受到这个问题和答案的启发 这是指向 stackoverflow 的内联链接。

Answer 1

据我了解，您可能想要这样的东西：

MATCH (b:BOC_beroep)-[r:MAPS_TO]->(s:Soft_Skill)
WITH SUM(1) AS total, r.type AS type, COLLECT(r.b) AS type_sum
WITH REDUCE(total=0, number in type_sum | total + number) AS type_sum, type, total
WITH COLLECT ({type: type, type_sum: toFloat(type_sum)}) AS data, SUM(total) AS total
UNWIND data AS d
WITH d.type_sum / total * 100 AS percent, d.type AS type
RETURN percent, type
ORDER BY percent DESC

样本数据：

MERGE (a1:BOC_beroep {occupation: 'dokter', code_occupation: 'sk_565'})  
MERGE (a2:Soft_Skill {skill_code: 'sk_687', name: 'leren'}) 
MERGE (a1)-[:MAPS_TO{type:"optioneel", b:0.5, k:1}]-(a2)
MERGE (a1)-[:MAPS_TO{type:"optioneel", b:0.5, k:2}]-(a2)
MERGE (a1)-[:MAPS_TO{type:"essentieel", b:1, k:3}]-(a2)
MERGE (a1)-[:MAPS_TO{type:"essentieel", b:1, k:4}]-(a2)

退货：

╒═════════╤════════════╕
│"percent"│"type"      │
╞═════════╪════════════╡
│50.0     │"essentieel"│
├─────────┼────────────┤
│25.0     │"optioneel" │
└─────────┴────────────┘