uncleflo
Registered since September 28th, 2017
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Managing Hierarchical Data in MySQL
Saved by uncleflo on May 15th, 2017.
Most users at one time or another have dealt with hierarchical data in a SQL database and no doubt learned that the management of hierarchical data is not what a relational database is intended for. The tables of a relational database are not hierarchical (like XML), but are simply a flat list. Hierarchical data has a parent-child relationship that is not naturally represented in a relational database table. For our purposes, hierarchical data is a collection of data where each item has a single parent and zero or more children (with the exception of the root item, which has no parent). Hierarchical data can be found in a variety of database applications, including forum and mailing list threads, business organization charts, content management categories, and product categories.
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mysql - Find highest level of a hierarchical field: with vs without CTEs - Database Administrators
Saved by uncleflo on March 26th, 2015.
I have a self-referencing table with a primary key, id and a foreign key parent_id. Given a name, how can I query the top-level parent? Given a name, how can I query all of the id's associated with a record of name = 'foo'?
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Hierarchical data in MySQL: easy and fast
Saved by uncleflo on March 26th, 2015.
Storing hierarchical data in a relational database is a classic problem. Relational databases are not really designed for this purpose, because they store data in flat rows. Storage is actually the least of our problems. Imagine a commenting system with an unlimited level of nesting in replies.
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