Does the post office offer this info? There used to be a service (Melissa)
that had Lat. and Long. for the center of each zip code. You could use that
to computer "all addresses in a 50 mile radius". but from what I understand,
it's gone now. I would love to find something where I could make these kind
of comparisons. Gotta URL ?
Cal
http://www.calevans.com
-----Original Message-----
From: The Tilghman [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 07, 2001 2:26 PM
To: 'Cindy'; [EMAIL PROTECTED]
Subject: RE: slicing strings for comparison?
Check out SUBSTRING in the manual.
On the zip codes, you're better off not trying to do any
comparisons in SQL -- the way they work is extremely
complicated. I would suggest that you purchase distance
measurements between two arbitrary zip codes from the
Postal Service, if you intend to be accurate.
-Tilghman
--
"There cannot be a crisis today. My schedule is already full."
--Henry Kissinger
> -----Original Message-----
> From: Cindy [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, February 07, 2001 13:33
> To: [EMAIL PROTECTED]
> Subject: slicing strings for comparison?
>
>
>
> I have a select I'd like to do...I have 2 kinds of people -- those
> needing interviews, and those doing interviews. Among other things,
> each person has their home address/phone in the tables. I want to
> generate lists of interviewers in close geographical proximity to the
> interviewees. I can do the city check easily of course, but I'm
> stumped on telephone exchanges and zipcode matches.
>
> The telephone numbers are stored as char[12] (three digits, dash,
> three digits, dash, four digits). I want to compare the second
> set of three digits to each other, something like
>
> WHERE Interviewee.homephone[4-6] = Interviewer.homephone[4-6]
>
> Similarly for zip codes, I want to compare the first three characters
> of a char[10] (zip plus 4], essentially
>
> WHERE Interviewee.zip[0-2] = Interviewer.zip[0-2]
>
> Are these types of comparisons possible? If so, what's the syntax? I
> couldn't find anything in the online documentation, though it's
> possibly not called "slicing" or "string range"...
>
> --Cindy
> --
> [EMAIL PROTECTED]
>
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