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Convert Char to number


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You can't multiply a character, you multiply numbers. If the field only stores numbers it would be a lot better to just make it a number field. If you want to keep it as characters then you will need to convert it to a number whenever you do an operation. It will probably be best to use the database's functions to do the conversion, so check the documentation for the database that you're using to find out what the conversion functions are.

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