Questions tagged [hierarchy]
For issues relating to arranging items into ordered levels.
163
questions
2
votes
0answers
40 views
MS-SQL and HierarchyID
I have been using HierarchyID for the last 2 years in some of my tables for obvious purposes
And I have kept a Column (int) for the last node number
for example if I have these rows so the int column ...
2
votes
0answers
56 views
Postgres ltree: Get all accessable resources by groups and sub groups
Have following Data scheme:
Roles:
Each role has either a resource assigned or a resource_group. A user wich has a role on a group has also access to all resources that are within the group or within ...
0
votes
1answer
33 views
MSSQL Merge 3 hierarchy tables
I want to merge 3 hierarchy tables into one table.
The 3 tables:
CREATE TABLE dbo.tbl1 (
key1 varchar(50) NULL,
key2 varchar(50) NULL
) ON PRIMARY
CREATE TABLE dbo.tbl2 (
key2 varchar(50) ...
1
vote
3answers
86 views
Constraint to prevent immediate loop in hierarchy
I have a companies table:
CREATE TABLE companies (
id bigserial,
name varchar(255) NOT NULL
PRIMARY KEY (id)
)
I want companies to have parents and childs. A company might have many parent and ...
2
votes
1answer
364 views
Recursively find the path to all leaves descending from a given parent in a tree
I'm trying to write a query to identify the path to each furthest descendant of a particular parent node in a table of tree structures like:
0 1
| |
2 3
| |
4 5
...
0
votes
0answers
35 views
How to represent Hierarchical data in Redshift when using OBT denormalised table design
We are loading a fairly simple dataset with 50-60 columns into Redshift in a flat One Big Table denormalised design (with just time dimension and one other split away). It will represent an ...
2
votes
1answer
70 views
Org chart CTE with exact index but plan shows expensive sort node
I've got a moderately large table (148 million rows) that's got pretty common org chart attributes to it. Names are changed, but it's the same idea. I was thinking of adding a hierarchyid column to ...
3
votes
1answer
63 views
Ordering CONNECT BY siblings
I have an hierarchical query that uses CONNECT BY:
select
wonum,
parent,
classification,
classstructureid,
division,
worktype,
status,
glaccount,
fircode,
...
1
vote
1answer
43 views
Relationship design for areas, managers and general manager
Given some specifications I need to design a database for an organization. One of the parts has to do with areas. In the organization there are different areas, each area has a boss, and there is also ...
0
votes
1answer
52 views
How to improve poor performance with two joined CTE expressions on hierarchical data?
I have a table of hierarchical data where I want to select entries that, 1) only include matches that are descendants of a given parent, and 2) returns the full hierarchical path of the matched ...
1
vote
0answers
68 views
Recursively list dependencies / references of a stored procedure
I'm trying to import a subset of our production dump with impdp for our local development database running on Oracle XE.
To find out what other objects I have to import for a particular stored ...
0
votes
1answer
25 views
Aggregating nested set models with field constraints
I have a table built on the nested set model that basically records transactions of different natures (defined by the field idx):
pk lft rgt idx value
1 1 30 2783 20402.710000
2 ...
9
votes
1answer
256 views
Find friends of friends (recursively) efficiently using Postgresql
Objective: Users submit their Contact Books, and then the application looks for connections between users, according to their Phone Number. Something like "6 Handshakes" idea (https://en....
1
vote
2answers
470 views
Hierarchical data using closure table, how to ensure that a column is unique within the parent node?
I store hierarchical data in a Node-table, combined with a closure table (NodeClosure). Each node has a column "name" that should be unique among the sibling nodes (link to parent-Node + ...
2
votes
3answers
197 views
Foreign key reference to column that is no primary key
I know, foreign keys should uniquely identify rows and therefore reference a primary key.
However, consider my example: There are 4 pre-defined categories, and for some combinations of values for ...
0
votes
1answer
360 views
Pattern for copying hierarchical data from one table to another?
Imagine a table with three columns: an ID primary key, a nullable ParentID referencing the ID column on that same table, and a TreeID to indicating the records that make up a particular tree. A basic ...
-1
votes
1answer
115 views
SQL Variables inside SELECT query in a function
MariaDB 10.3.14
I have a function that generates the root id in a hierarchy:
The function is this:
CREATE FUNCTION `getRootId`(GivenID INT) RETURNS int(11)
DETERMINISTIC
BEGIN
DECLARE ch INT;
...
-1
votes
1answer
95 views
MS SQL 2017: hierarchy tree - get quantity of last level components
There's a table of items with their components. Components depth vary i.e. some items may have one level of components other may have tens nested components. I need to get quantinty of last level ...
1
vote
1answer
52 views
Generate hierarchical path
I have a classstructure table:
create table classstructure (classstructureid number(8,0), classificationid varchar2(25), parent number(8,0));
insert into classstructure(classstructureid, ...
1
vote
1answer
172 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 ...
0
votes
1answer
18 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 ...
0
votes
0answers
43 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, ...
0
votes
0answers
800 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 ...
2
votes
1answer
79 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 ...
2
votes
1answer
1k 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 ...
1
vote
0answers
246 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
votes
2answers
3k 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
votes
3answers
69 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)
)...
0
votes
1answer
337 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 ...
3
votes
2answers
3k 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 ...
3
votes
1answer
1k 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
vote
1answer
976 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 | ...
2
votes
1answer
1k 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(...
1
vote
0answers
351 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 ...
2
votes
0answers
51 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 ...
1
vote
0answers
71 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 ...
-2
votes
2answers
114 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 ...
1
vote
0answers
59 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?...
8
votes
3answers
21k 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 ...
2
votes
1answer
145 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 ...
1
vote
1answer
39 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 ...
3
votes
2answers
556 views
Get all descendants from 3 hierarchical tables
I have the following tables within a database:
+-------------+ +-------------+-------------+ +---------------------------+
| project1 | | project2 + | project3 ...
0
votes
1answer
296 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 ...
3
votes
2answers
68 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
votes
1answer
3k 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 ...
3
votes
1answer
125 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 ...
1
vote
1answer
127 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
...
0
votes
1answer
179 views
Procedure for tree view [duplicate]
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
votes
2answers
41k views
Parent Child Relation in same Table
I have a table storing parent/child records as such:
+-------+------------+---------+---------+------------+-----------+
|custid | custname | deptid | company |parentcustid| enrolled |
+=======+==...
0
votes
1answer
992 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 ...
