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Message Posted: Thu, 17 Jun 2004 @ 11:44:48 GMT


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Subj:		Re: How to identify numerics in alphanumerics ?

From:		Victor Sokovin

If you already know the data contains only numbers and letters, then the following will select all rows with pure numeric values:

sel col1 where upper(col1) (cs) = lower(col1);

This works by converting the alpha characters to uppercase (left side) and lowercase (right side) and then doing a casespecific comparison. If the two sides are not equal (for a particular row), then you know column1 does not contain pure numerics (e.g. digits 0 through 9).

I'm pretty sure this works for the English characters but there are exceptions in other languages. For example, consider the German '�' character. I don't know whether it will survive the posting process. If it does not, it is the one you see in the word "stra�e" (it might be the old spelling of this word, though). This character will appear in the result set of the above query together with the numeric values.

I did not take a look at other languages from this point of view but I would not be surprised if one can find more of such characters.

The alternative might be to use

     select col
     from table
     where col <'a'

or something along these lines.

Regards,

Victor


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