database design - Node in multiple linked list -


in our neo4j graph created serval linked list of top items specified category.

example:

top-50 week 2016-01 - mike posner - afrojack - willy william

at point created this:

 (node top 50 week 201601)-[first]->(node mike posner)-[next]->(node afrojack)-[next]->(node willy).

but next week, order changed willy, mike, afro. , end having multiple next relationships on each artist. traversal list slower.

any idea, how model in better way.

the answer @stdob-- more valid, doesn't scale well.

imagine want find artists ever been number 1 , how many times, you'll have match of them traversing relationships , filter on rank property. nightmare if have 1 million artists.

the idea of linkedlist fine, nodes in linkedlist can example rankitem node related artist.

(week1)-[:first]->(rankitem)<-[:has_ranking_positon]-(artist)

for previous question, can :

match (w:week)-[:first]->()<-[:has_ranking_position]-(artist) return artist, count(*) occurences

depending on queries you'll need do, makes sense have rankinglist rankitem connect also.

(ranking {v:1})-[:next]->(ranking {v:2})-[:next]->(.....

in case, rankingitem connect list

making things more performant questions :

based on artist, find me artists have common pattern of ranking history


-

Comments

Post a Comment

Popular posts from this blog

scala - 'wrong top statement declaration' when using slick in IntelliJ -

Image
i'm porting project scala 2.9 2.10, therefore have use slick instead of scalaquery. i'm using slick 2.1.0 since supports ms access. according this tutorial , upgrade guide changed robs object class , added val robs : why error message wrong top statement declaration , how rid of it? edit: i'm new scala... according this question seems can't put val outside of methods or classes, right? code above directly in packge. right approach slick then? should move code in class or trait? according this changed val robs = tablequery[robs] to object robs extends tablequery(new robs(_)) {} . no warnings or errors anymore. :)
Read more

c# - DevExpress.Wpf.Grid.InfiniteGridSizeException was unhandled -

Image
when using devexpress, see error: devexpress.wpf.grid.infinitegridsizeexception unhandled message="by default, infinite grid height not allowed since grid rows rendered , hence grid work slowly. fix issue, should place grid container give finite height grid, or should manually specify grid's height or maxheight. note can avoid exception setting gridcontrol.allowinfinitegridsize static property true, in case grid run slowly." the problem dxgrid has infinite height. to fix, set height non-infinite. snoop absolutely invaluable this: if "height" xaml element infinite (i.e. 0 or nan ), can set using one of following: option 1: height="{binding path=actualheight, relativesource={relativesource mode=findancestor, ancestortype=uielement}}" option 2: verticalalignment="stretch" option 3: height="auto" hint: use verticalalignment="stretch" if child of grid <rowdefinition height=
Read more

PySide and Qt Properties: Connecting signals from Python to QML -

i trying run simple pyside appliccation design made in qml. call function in qml python in separated thread. i have following qml view: import qt 4.7 rectangle { visible: true width: 100; height: 100 color: "lightgrey" text { id: datestr objectname: "datestr" x: 10 y: 10 text: "init text" font.pixelsize: 12 function updatedata(text) { datestr.text = qstr(text) console.log("you said: " + text) } } } here application: some imports.... #!/usr/bin/python import sys import time pyside import qtdeclarative, qtcore pyside.qtgui import qapplication pyside.qtdeclarative import qdeclarativeview the qthread worker.... #worker thread class worker(qtcore.qthread): updateprogress = qtcore.signal(int) def __init__(self, child): qtcore.qthread.__init__(self) self.child = child def run(self):
Read more