neo4j cypher query for hierarchical relationship matching -

-

i'm modeling set of nodes has hierarchical relationships (as parent relationship) additionally non-hierarchical relationship.

let's it's family tree relationships birth country each person, simplicity

so each birth country node , each person node, , might create relationship in cypher as:

start parent=node(123), child=node(456) create parent-[:parent]->child;

and 

start person=node(123), country=node(789) create person-[:born_in]->country;

what i'd is, example, list of folks don't have ancestors england, or folks have ancestor japan, or like. feel should reasonable query, new cypher , haven't clue how construct it.

update ** after more extensive testing of cases, i've found query doesn't work right in some. given child 1 parent england , grandparent not england, query children without ancestors england incorrectly returns child parent england. looks way i've written query, return grandparent having null relationship england. query follows:

start n=node(*), ancestor=node(123) match n-[r:parent*]->o-[b?:born_in]->ancestor b null  return distinct n;

if person's ancestors born in country in question, works fine.

you can use variable length relation include children/ancestors. picked "folks have ancestor japan":

start country=<lookup japan> match (child)-[:parent*0..5]->(parent)-[:born_in]->(country) return child

note: have not tried logically should it. picked random depth of 5.

match a-[:parent]->b-[:born_in]->z

as mentioned in example should find persons (a) have parent born in z

if have data set handy on console.neo4j.org maybe, take @ what's happening.


Comments

Post a Comment

Popular posts from this blog

Hatching array of circles in AutoCAD using c# -

-
i beginner in autocad plugins .i have created array of circle using following code. now, have hatch circles in array .how that??how hatch circles @ once? moreover, how can return hatch method , use hatch objects.sorry language.thanks in advance. [assembly: commandclass(typeof(beamsection.class1))] namespace beamsection { public class class1 { //class1 obj = new class1(); [commandmethod("beamatsupport")] public void addlightweightpolyline() { // current document , database document acdoc = application.documentmanager.mdiactivedocument; database accurdb = acdoc.database; promptpointresult ppr = acdoc.editor.getpoint("\nselect starting point "); var ucs = acdoc.editor.currentusercoordinatesystem; point3d startingpt = ppr.value.transformby(ucs); list<double> radius = new list<double>(); radius.add(0.5);
Read more

ios - UITEXTFIELD InputView Uipicker not working in swift -

-
hello trying pop uipickerview view programmatically when user clicks on textfield. have tried doesn't doing anything. isn't working. nothing happening when click textfield class userprofiletableviewcontroller: uitableviewcontroller,uitextfielddelegate,uipickerviewdelegate,uipickerviewdatasource { var itempicker: uipickerview! = uipickerview() @iboutlet weak var gendertxtfield: uitextfield! var gender = ["male","female"] override func viewdidload() { super.viewdidload() gendertxtfield.delegate = self itempicker!.delegate = self itempicker!.datasource = self itempicker!.backgroundcolor = uicolor.blackcolor() self.gendertxtfield.inputview = itempicker } func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{ return 1 } // returns # of rows in each component.. func pickerview(pickerview: uipickerview, numberofrowsincomponent component:
Read more

Python Pig Latin Translator -

-
so have been working on @ codecademy.com while trying learn python. don't know if blind , can't see why won't work or what. here's code won't let me use. function print variable if had typed in , print "empty" if didn't type anything. print "welcome english pig latin translator!" original = raw_input("what's name?") if len(original) > 0 print original else print "empty" if len(original) > 0 else the above lines contains syntax errors. try: if len(original) > 0: else: note added colons, ( : ).
Read more