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Storing multiple items in one MySQL field?

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Hello phpers and sqlheads,
If you have a moment, I have a question.

INTRO:
I am trying to set up categories for a web site.
Each item can belong to more than one category.

IE: Mens, T-Shirts, Long Sleeve Shirts, etc.. etc..
(Sorry no fancy box drawing)

QUESTION:
My question is what would the best way be to store this in one MySQL field and how would I read and write with PHP to that field? I have thought of enum() but not on the forefront of what that actually does and what it is best used for. I just know its a type of field that can have multiple items in it. Not sure if its what I need.

REASON:
I just want to be able to query the database with multiple category ID's and it check this field and report back if that category is present or if there are multiple present. Maybe return as a list or an array? I would like to stay away from creating multiple fields in my table for this.

NOTE:
The categories are retrieved as a number FYI.


Any help/code would be greatly appreciated.
But a link does just fine for me.

Best Regards,

Karl DeSaulniers
Design Drumm
http://designdrumm.com

Hope your all enjoying your 2012!

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