I would look into understanding how to normalize your databases.

http://databases.about.com/od/specificproducts/a/normalization.htm

The problems I have personally experienced with normalizing a database 
is that oftentimes you can over-normalize a database to the point that 
it creates havoc on response times.

I would read up on how to normalize your database up to 3NF for this 
particular situation.

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