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Questions tagged [hierarchy]

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For issues relating to arranging items into ordered levels.

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74 views

Database Design - hierarchical structure

We are trying to redesign a database that currently holds thousands of parameters for different datatypes and currently has a flat data structure. We generate XML files from the database, which our ...
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1answer
13 views

Is there such a thing as an OLAP cube that can change the number of levels in a hierarchy without having to be rebuilt?

The current analytics solution that my team works with cannot handle changes in the structure of one of its hierarchies. If a new level or branch is added, then the entire domain must be first backed ...
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31 views

How to retrieve all children of a parent record?

I have one MySQL table with this columns: id father son street city I want to obtain all descendants of a father recorded, how I can do this? I tried this: WITH RECURSIVE filhos AS ( select login, ...
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120 views

Sql subquery for nested parent child data

I have two tables , on parent table (categories ) and child table (features).. I have this query select c.* , (select GROUP_CONCAT(f.featuresId , f.featuresTitle ) from ...
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1answer
38 views

How to select id of father from the child id recursively

I have in the field cod_categorizacao_pai the ID of the father, and I need to mount a select that just enter an ID and it will list the paternal IDs of this ID until it reaches the parent of all. How ...
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1answer
151 views

How to query all entities associated with all children (recursive) of a node in SQL?

This question is about SQL in general. Answering specifically for MySQL would be helpful but not necessary. Ok, I’m having trouble putting this into words… so bear with me. Say I have a tree of ...
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84 views

Worked example of closure tables with from and thru dates

I work for a law enforcement agency, and have been asked to create a way of storing the chain of command in such a way that its structure can be viewed at any point in time, not only as it is now. ...
3
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3answers
393 views

SQL Server CTE Bottom to Top Recursive with Where clause

I have an Employee Table with an EmployeeId, ManagerId and a Name field. The goal is to make a recursive With fetching all the rows from an employee to the top manager (ManagerId is null). I found ...
4
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3answers
66 views

How can I pass on a value in the hierarchy based on the value of the parent using an hierarchial query?

I have a table with categories and another table with a discount for categories per user: create table category ( id NUMBER NOT NULL, parent_id NUMBER, name nvarchar2(255), PRIMARY KEY( id) )...
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Hierarchical database schema design - X500 data model [closed]

I have to make a centralized database for appliance configurations, and SQL is a no-go because was evaluated as too expensive in terms of resources for read-mostly load. We planned to use ...
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1answer
101 views

Hierarchical / tree data - which type of database to use & design?

For querying (and writing to) a hierarchical structure (like a folder containing files and other folders, up to n levels deep, where n is pretty small, probably around 10, and there would be lots of ...
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1answer
88 views

Advantages of a hierarchical schema for private chat

This post claims that All modern chatting interfaces, without exception, implement a hierarchical and a not-chronological schema for chat. It also links another post which gives an example ...
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165 views

How to create HierarchyId node constraint without GetAncestor table column?

I have a table similar to the following that holds hierarchies from difference sources (SourceId). CREATE TABLE dbo.Hierarchies ( SourceID INTEGER NOT NULL, NodeHierarchyId HierarchyId NOT ...
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1answer
582 views

Parent Child Relation in same Table . Select Query to get only parent records and Records not comes under parent child relation

I have a table with Parent-Child Relation in the same Table. Some Sample Data id │ name │ parent │ is_active ════╪══════════════════════╪════════╪═══════════ 1 │ Company A ...
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1answer
369 views

How to do hierarchical queries without CTE tables or recusive queries in Snowflake? (parent, child relationships)

I have several tables in Postgres that we are migrating to Snowflake. Some of these table are hierarchical (a foreign key point to the same table), normally to query this data I use CTE tables and/or ...
1
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1answer
237 views

Oracle hierarchical query: aggregate over each node's descendants, give results in tree pre-order

Given hierarchical data, for each item I need to get the sum of a column over the sub-tree rooted at the item, and I need the results in pre-order. Example: for the data employee_id | manager_id | ...
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1answer
306 views

How make recursive json on mysql

my table looks like CREATE TABLE `test_comments` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `parent_id` int(10) unsigned DEFAULT NULL, `test_id` int(10) unsigned NOT NULL, `user_id` int(...
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0answers
136 views

How to get the hierarchy of particular employee using JPA spring boot?

I am trying to find a way to get the employee hierarchy in an organization using JPA and Spring boot. The problem is similar to the following link Similar Data Model If A reports to B and B reports ...
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0answers
43 views

Design for a child to have a single parent `A` OR `B` with FK cascade constraint?

I'm assuming this is not possible with PK and FK... Let's say I have tables A, B, and C. A and B are "parents", and B and C are "children" A is the root B can be the child of either A or B C ...
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60 views

Scalable way to manage aggregated statistics over time in hierarchy?

I'm using a closure table (Postgres through Django) to roll up stats through a hierarchical tree. When a node that is 10 layers deep has a value that increases, each parent's sum total of that value ...
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2answers
87 views

What's the best way to represent an event from a system in a chat?

Conversations -------------- id Messages -------------- id conversation_id user_id reply_to_id content created_at I was looking at this question and I had a question: How to build a table for a ...
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0answers
52 views

Nested set model in higher dimensions

The nested set structure is well-known and involves using left and right values to denote the relative heirarchy of nodes on one axis. Is there a generalization of this structure to higher dimensions?...
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3answers
8k views

Parent/Child Relationship Table Design - What's The Best Practice?

I have a single table for storing 'Tasks'. A task can be a parent and/or a child. I use the 'ParentID' as the FK referencing the PK on the same table. It is NULLABLE, so if it is NULL it does not have ...
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1answer
101 views

Correct way to join row in parent table to row in one of several children tables

I have a parent table product, and several children tables like phone, tablet, smartwatch etc. The parent and children have 1-1 relationship. This means that for every row in parent table, there will ...
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1answer
30 views

How to add foreign key in a table where column value can come from two different tables?

I have three tables create table main_comments ( id serial primary key, comment text not null ); create table sub_comments ( id serial primary key, main_id integer not null, comment ...
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2answers
265 views

Get all descendants from 3 hierarchical tables

I have the following tables within a database: +-------------+ +-------------+-------------+ +---------------------------+ | project1 | | project2 + | project3 ...
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1answer
102 views

Bypass truncated data type error in `CREATE TABLE AS`

I am attempting to recreate the code from this excellent tutorial in MariaDB 10.2 to try and build nested sets from an existing adjacency list. (The goal being to ingest changes to the adjacency list ...
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2answers
55 views

Nullable, dependent attributes

I'm designing a database for students. Computer science students here in Switzerland can decide between different specializations, e.g. application development, system engineering etc. There are ...
5
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1answer
1k views

Condition in WHERE vs condition in CONNECT BY

Can anyone explain to me the difference between the following two queries? Even though they seem the same the results are different. select concept.concept_id, concept.PARENT_ID from ...
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1answer
70 views

How to store hierarchical dimension for timeseries data

I have a requirement to store data about a load of Searches. Each time someone searches we want to record it for analyzing later on. As part of the search the user can select one or more Categories ...
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1answer
56 views

Select top-most folder in a hierarchy by given criteria in MySQL

I'm using MySQL (5.7.20) to store a folder hierarchy. Each folder is stored together with all direct and indirect parents including the distance. As an example, the following folders A +- B + C ...
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1answer
120 views

Procedure for tree view

I trying to fetch data form database which is have 3 column unique_id, parent_id & node_name, but this query (Given in below) is return only two rows. Condition: every parent has two child. DROP ...
5
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2answers
19k views

Parent Child Relation in same Table

I have a table storing parent/child records as such: +-------+------------+---------+---------+------------+-----------+ |custid | custname | deptid | company |parentcustid| enrolled | +=======+==...
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1answer
209 views

Design: Postgres, Parent to Child / Child to Parent / Child to Child | JSONB

I am very new to database design. I am hoping for suggestion or solutions for a feature I am working. Note: We are majorly using JSONB type in Postgres Feature: I have a orders table which would ...
3
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1answer
245 views

Is a Self-defining Table of Domains Normalized?

I don't really know the official name of what I've made but it can't be the first time this has been made, so apologizes up front for not knowing every term. My question, is a table as outlined below ...
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1answer
161 views

Why does Oracle yield multiple levels per row in this hierarchical query?

I'm trying to reproduce the first simple example from this tutorial. However, I don't understand why I get so many rows back. I would expect that 1 reports to 2 only at level 1 and not at level 2 as ...
2
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2answers
4k views

How to organize binary tree in database? [closed]

Here is the situation, I need to organize some users like an binary tree to explain organization workflow, but organization can change. Here is how its look like: 1 / \ 2 ...
2
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0answers
386 views

Auto-update hierarchyid of multiple records in INSTEAD OF UPDATE trigger

I am working with an INSTEAD OF UPDATE trigger, where I have to calculate / re-calculate the hierarchyid of a row based on another column value. Thus far, I have it working. The problem that I run ...
0
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1answer
195 views

Recursive Seller Account with Balance

I need to build a database for managing Short Messaging Service (SMS). In this I have 2 types of users Reseller Must have starting SMS balance for example: 1,000 - credit table He can sell ...
3
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2answers
3k views

Get Nested/Hierarchical Data from SQL Table

I have a table relationship between 'Tag' and 'Task'. It is M:M. The relationship is mapped in the table 'TagTaskMapping'. The TagAssignment table stores the relationship between a Tag and a date. So ...
0
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1answer
699 views

While Loop - Parent/Child Tree

I'm trying to recursively loop through and return all child_id's that have the root element of 9. The structure: ->9 ->->8 ->->->17 ->->22 ->->->11 Parent Child ...
0
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1answer
87 views

How to retrieve all the rows where primary key value found in the other column in the row in MySql

Following is MySql Table in the snapshot: column sno could be found in the other rows in column p_sno. i.e. sno = 5 linked through p_sno = 5 with sno = 6 (two rows) sno = 8 linked through ...
5
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2answers
201 views

Find missing folders paths in split hierarchies

I have a table which contains folders' paths. This table contains four columns: DirID - The folder's ID. BaseDirID - The ID of the first folder in the hierarchy. So all the folders (paths) from the ...
2
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2answers
2k views

How to flatten and pivot a normalised hierarchy table

I have an OrgChart table that looks something like this: PositionCode PositionName ParentCode Level AA0001 CEO 0 AA0002 CFO AA0001 1 AA0003 ...
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3answers
710 views

Create parent node and parent id [closed]

I have a table which contains id, nodeid, nodevalue, and nodelevel columns. Now I want to create new temp column ParentnodeId. I tried using CTE but not getting the correct result. Id Nodeid ...
2
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1answer
556 views

Unflatten hierarchical data in SQL Server

I have some tables in the staging area of a data warehouse that I'm filling with data from some flat, comma-delimited text extracts from another system. When the data comes in the hierarchy of parents ...
1
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1answer
65 views

Which postgres design for a nested resource that can link to the same type of resource

I have this kind of data that I need to store in postgres (ruby object). #<InitRes:0x007f8ec3734c78 @kind="RestrictionsSchema", @restrictions= [#<ParsedRes:0x007f8ec60ed218 @...
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0answers
1k views

Joining recursive table in PostgreSQL

Situation I have two simple tables, one called "node_relations" and one called "node_information". The table "node_relations" represents a simple parent-child hierarchy, having only two columns "id" ...
0
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1answer
215 views

SQL relationship for nested groups

I'm working on a creating a database schema for a legacy app that currently saves its data to XML files. I'm having trouble representing this relationship: Task Group 1 contains |-- Simple Task 1 |--...
8
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2answers
12k views

Can I get a tree-structure from a self-referenced (hierarchical) table?

Given a hierarchical table like this: CREATE TABLE [dbo].[btree] ( id INT PRIMARY KEY , parent_id INT REFERENCES [dbo].[btree] ([id]) , name NVARCHAR(20) ); I would like to obtain the whole tree ...

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