RE: HELP: SQL count(*) to weed out duplicates

I've never got that to work, so I use:



          select pdiv, ptyp, pvnd, ppo from pohedrl3 a , pohedrl3 b
        where a.pdiv = b.pdiv and a.ptyp = b.ptyp and a.pvnd = b.pvnd
        and a.ppo = b.ppo and a.(some unique field) > b.(some unique field)

        Do not use a.(some unique field) <> b.(some unique field) because it
will list twice.

You can use a JOIN  if preferred.

One caveat: If there are more than 2 records with the same key you will get
duplicates.

Hope this helps.

JN

> -----Original Message-----
> From: Bale, Dan [SMTP:DBale@TFSA.Textron.com]
> Sent: Monday, February 21, 2000 2:53 PM
> To:   'MIDRANGE-L@midrange.com'
> Subject:      HELP: SQL count(*) to weed out duplicates
> 
> It's been awhile, but...
> 
> Today a requirement came up where I have to identify duplicate keys in a
> file.  In the past, I used SQL to do this and seem to recall using
> count(*)
> in some fashion, i.e.:
> 
>   select pdiv, ptyp, pvnd, ppo, count(*) from pohedrl3
>   group by pdiv, ptyp, pvnd, ppo
> 
> This results in:
> 
>                VENDOR                            
>   DIV  TYPE    NUMBER   PO NUMBER     COUNT ( * )
>   ---  ----  --------  ----------  --------------
>    1   MSC    70,225       8,101               1 
>    1   MSC   110,275       7,724               1 
>    1   MSC   160,415       7,725               1 
>    1   MSC   160,415       7,726               1 
>    1   MSC   160,415       7,727               1 
>    1   MSC   160,415       7,728               1 
> (continued for 10000 more rows)
> 
> How do I specify that I only want count(*) > 1?  Specifying "where
> count(*)
> > 1" causes numerous syntax errors, no matter where I place it.  A look at
> the infocenter SQL manuals yielded no clues.
> 
> If someone answers this, could you kindly reply to DBale@TFSA.Textron.com
> as
> well as MIDRANGE-L so that I get this ASAP?  Thanks!
> 
> - Dan Bale
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