hierarchy

This is very relevant to the question SQL query to get full hierarchy path . The only difference is that my hierarchy contains different entity types from different tables, for example: Project Phase Folder Document I want to select all documents along with their full paths (from poject level to folder level). Phases and folders can have subphases and folders. I'm horrible at SQL and just can't figure out how to adapt the answer to the linked question to suit my needs. Data model and example data DECLARE @Project TABLE (ID INTEGER, Name VARCHAR(32)) DECLARE @Phase TABLE (ID INTEGER, Project_ID

I have the following datasets in SQL Server Hierarchy Table: Report | Immediate Parent Child1 Parent1 Child2 Parent1 Child3 Parent2 Parent1 Grandparent1 Parent2 Grandparent1 Data Table (Only exists for Base level children): Report | Sales Child1 1000 Child2 1000 Child3 1000 From this I need to create a dataset which contains Report | Sales Parent1 2000 Parent2 1000 Grandparent1 3000 I do not know how many hierarchy levels there will be, could be great *10 grandparents. My solution to this problem was to use recursion and dynamic SQL to keep creating temporary tables for each hierarchy level i

C# | .NET 4.5 | Entity Framework 5 I have data coming back from a SQL Query in the form of ID,ParentID,Name. I'd like to take that data and parse it into a Hierarchical JSON string. So far it seems to be much more of a daunting task than it should be. Since I'm using Entity the data comes back nicely to me as an IEnumerable. Now I believe I just need some form of recursion, but I'm not quite sure where to start. Any help is appreciated. Data Returns as id parentId name 1 1 TopLoc 2 1 Loc1 3 1 Loc2 4 2 Loc1A Code is public static string GetJsonLocationHierarchy(long locationID) { using

I am relatively new to Rails and am working on a project that involves multiple, "nested" levels of data. I am having issues making the proper associations so I can get all the child elements of a model 3 levels higher. Here is an example of the models: class Country < ActiveRecord::Base has_many :states end class State < ActiveRecord::Base belongs_to :country has_many :cities end class City < ActiveRecord::Base belongs_to :state has_many :people end class Person < ActiveRecord::Base belongs_to :city end I have implemented a relationship in the Country model, has_many :cities, :through =>

I'm storing categories using a hierarchical model like so: CATEGORIES id | parent_id | name --------------------- 1 | 0 | Cars 2 | 0 | Planes 3 | 1 | Hatchbacks 4 | 1 | Convertibles 5 | 2 | Jets 6 | 3 | Peugeot 7 | 3 | BMW 8 | 6 | 206 9 | 6 | 306 I then store actual data with one of these category ids like so: CARS vehicle_id | category_id | name ------------------------------- 1 | 8 | Really fast silver Peugeot 206 2 | 9 | Really fast silver Peugeot 306 3 | 5 | Really fast Boeing 747 4 | 3 | Another Peugeot but only in Hatchbacks category When searching for any of this data, I would like to