What do you call the concept of dynamic data definition?

Posted by DJTripleThreat on Stack Overflow See other posts from Stack Overflow or by DJTripleThreat
Published on 2010-05-12T11:40:06Z Indexed on 2010/05/12 11:44 UTC
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database-design

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dynamic-data

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data-definition-language

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design-patterns

Maybe this is simpler and more straightforward then what I'm thinking but I can't seem to find this concept on google anywhere. The concept is this:

You have a table in a database and the table has a specified number of columns. However, it has been asked of me by previous clients that there also be a set of dynamic user defined columns that can be added on the fly.

What is this concept called and is it considered a design pattern?

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