Hi Michael, I think your query would result wrong results.
Michael - *KNOWS* - Julia - *KNOWS* - Robert - *KNOWS* - Michael (same Michael as previous one) It would consider Robert as a friend's friend for Michael (Michael - Julia - Robert). However, it is his direct friend ... (Robert - Michael) I think your solution can't work with cyclic graph ;) That's why I used shortestPath function, that clearly avoids that. What do you think? On Wednesday, March 16, 2016 at 12:03:52 AM UTC+1, Michael Hunger wrote: > > try this: > > MATCH (person:Person) > OPTIONAL MATCH (person)-[:KNOWS]-(f1:Person)-[:KNOWS]-(f2:Person)-[:KNOWS > ]-(f3:Person) > WITH person, count(distinct f1) as f1, count(distinct f2) as > f2,count(distinct > f3) as f3 > RETURN person._firstName + " " + person._lastName, f1, f2, f3 > > alternatively > > MATCH (person:Person) > OPTIONAL MATCH (person)-[:KNOWS]-(f1:Person)-[:KNOWS]-(f2:Person) > WITH person, count(distinct f1) as f1, count(distinct f2) as > f2,collect(distinct f2) as p2 > WITH person, f1,f2, reduce(x=0, p in p2 | x + size((p2)-[:KNOWS]-()) ) as > f3 > RETURN person._firstName + " " + person._lastName, f1, f2, f3 > > > > On Tue, Mar 15, 2016 at 10:30 PM, Michael Azerhad <michael...@gmail.com > <javascript:>> wrote: > >> Using Neo4J 2.1.5. >> >> Data: >> >> - 2000 Persons >> - KNOWS relationships between some of them >> >> >> Goal of the query: >> >> For each person, display her fullname + amount of friends + amount of >> friends' friends + amount of friends' friends' friends. >> >> >> MATCH (person:Person) >> WITH person >> OPTIONAL MATCH person-[:KNOWS]-(p:Person) >> WITH person, count(p) as f1 >> OPTIONAL MATCH path = shortestPath(person-[:KNOWS*..2]-(f2:Person)) >> WHERE length(path) = 2 >> WITH count(nodes(path)[-1]) AS f2, person, f1 >> OPTIONAL MATCH path = shortestPath(person-[:KNOWS*..3]-(f3:Person)) >> WHERE length(path) = 3 >> WITH count(nodes(path)[-1]) AS f3, person, f2, f1 >> RETURN person._firstName + " " + person._lastName, f1, f2, f3 >> >> >> This query lasts long ! : 60 seconds ! >> >> Is there a tips to optimize it? >> >> Thanks, >> >> Michael >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Neo4j" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neo4j+un...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to neo4j+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
