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http://www.sitepoint.com/article/hierarchical-data-database

These are the public entries for this link:

• Storing Hierarchical Data in a Database [PHP & MySQL Tutorials]
  
  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. Gijs explains two practical methods to do just that.
  By errant in Database with articles database sql
• Storing Hierarchical Data in a Database [PHP & MySQL Tutorials]
  
  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. Gijs explains two practical methods to do just that.
  By SyNeoK in Public bookmarks with database tutorial

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