WizzyWeb is a Web-based rapid application development (RAD) tool for creating PHP Web database applications for all popular databases, (e.g., MySQL, Oracle, SQL Server, Sybase, IBM, etc.)
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