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PL/SQl how do I guard against someone entering a form field that is not a number?

PL/SQl   how do I guard against someone entering a form field that is not a number?  

If they enter something that is not a number, what does the programming look like to check for non-numerical answers?
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mintsii
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mintsii
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FalconHawkCommented:
I think this is something thats more a Programming area question. You should post a 0 point pointer to this question, to get more responce. Greetz,
FHawk
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