translate question

From: <tday6_at_csc.com>
Date: Wed, 27 Jun 2001 11:47:58 -0700
Message-ID: <F001.0033A6C9.20010627101646@fatcity.com>

I've got this check constraint on a column (NBR) (which is actually a VARCHAR2(10)).

 translate(lpad(NBR,9,'0'),         '0123456789','----------') =
 '---------'        and    NBR between 1 and 199999999)

As far as I can see it's left padding the string with 0's to a length of 9, translating all numeric characters to '-', doing something else (= ' ---------') and testing to see if the resulting string is between 1 and 199999999.

Obviously I'm missing something here. Anyone care to enlighten me? I'm just documenting it, not designing it.

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