Comparing values from a string in a MySQL query

Posted by bellesebastien on Stack Overflow See other posts from Stack Overflow or by bellesebastien
Published on 2010-03-18T19:01:34Z Indexed on 2010/03/18 19:21 UTC
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mysql

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multiple-value

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comparison

I'm having some trouble comparing values found in VARCHAR fields.

I have a table with products and each product has volume. I store the volume in a VARCHAR field and it's usually a number (30, 40, 200..) but there are products that have multiple volumes and their data is stored separated by semicolons, like so 30;60;80.

I know that storing multiple volumes like that is not recommended but I have to work with it like it is.

I'm trying to implement a search by volume function for the products. I want to also display the products that have a bigger or equal volume than the one searched. This is not a problem with the products that have a single volume, but it is a problem with the multiple volume products.

Maybe an example will make things clearer: Let's say I have a product with this in it's volume field: 30;40;70;80. If someone searched for a volume, lets say 50, I want that product to be displayed.

To do this I was thinking of writing my own custom MySQL function (I've never this before) but maybe someone can offer a different solution.

I apologize for my poor English but I hope I made my question clear.

Thanks.

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