In relational Databases, of course.
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2up to 3NF, after that it gets advanced. – Johan Aug 30 '11 at 12:04
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33NF is a fair balance between good design and practicality. – Yuck Aug 30 '11 at 12:05
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See: http://stackoverflow.com/questions/2331838/normalization-in-plain-english for more info – Johan Aug 30 '11 at 12:07
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It depends on the reqquirment whcih normal form to use, Most of the people make use of 3NF.
But one thing is there as the normalization level increase joins will increase to get data from database server.

Pranay Rana
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