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Good one. In recent days I heard about Hirarchial Databases. What about them? Have they released??

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The hiearchical database model is somewhat older than the relational model. I think the most prominent system is IBM's IMS which (still) runs on older mainframe systems. With the evolution of object-relational or object-oriented DBMS this model has some kind of revival.

If you could wait some time, I've finished an article on this topic in german. Needs only to be translated to english. Then fine-tuned and hopefully published.

Frank

http://www.insidesql.de