Razza dimension server « Ranzal & Associates’ Weblog. Not well!! Does this resemble your IT person managing your financial master data? Traditionally, financial data marts and operation data stores are built and managed by IT. So how does the business user view and manage the hierarchies and metadata attributes without IT getting in the way? Coming from the IT side of the house, I have had the opinion that the business might “know the business”, but given the opportunity to manage a technical system they will take shortcuts and ultimately bring the IT solution back to a level they are comfortable with…and thanks to Bill Gates, Microsoft Excel ends up trumping the investment in technology. Hyperion Data Relationship Management.
Trees in SQL. A set-oriented method for representing trees in SQL that runs orders of magnitude faster than the adjacency list (i.e. child-parent pairs) method.
[Ed. note: A follow-up to this article is also available.] The usual example of a tree structure in SQL books is called an and it looks like this: Representing Trees in Oracle SQL. On its face, the relational database management system would appear to be a very poor tool for representing and manipulating trees.
This chapter is designed to accomplish the following things: show you that a row in an SQL database can be thought of as an object show you that a pointer from one object to another can be represented by storing an integer key in a regular database column demonstrate the Oracle tree extensions (CONNECT BY ... PRIOR) show you how to work around the limitations of CONNECT BY with PL/SQL The canonical example of trees in Oracle is the org chart.
Four ways to work with hierarchical data. Oops...
Page not found! We are sorry, but the page you are looking for might have been: Storing Hierarchical Data in a Database [PHP & MySQL Tutorials] This article was written in 2003 and remains one of our most popular posts.
If you’re keen to learn more about mastering database management, you may find this recent article on MySQL of great interest. Whether you want to build your own forum, publish the messages from a mailing list on your Website, or write your own cms: there will be a moment that you’ll want to store hierarchical data in a database. And, unless you’re using a XML-like database, tables aren’t hierarchical; they’re just a flat list. You’ll have to find a way to translate the hierarchy in a flat file. Storing trees is a common problem, with multiple solutions. Modeling Hierarchies. Published in Association with the Meta-Data and Data Modeling Summit June 14-16, 2005 - Long Branch, New Jersey For more information please visit - Possibly, the most difficult problem to support in the relational model is hierarchical data. A hierarchy according to Webster is a "group of persons or things arranged in order to rank grade, class, etc. " Examples are organization structures, product reporting structures, employee-manager relations, and customer-to-customer relationships.
Joe Celko's Trees and Hierarchies in SQL for Smarties, (The Morg.