Re: Counting Occurrences with SQL

Yep, dense_rank is eaiser than my idea of ROW_NUMBER()

select fld1, dte1,
DENSE_RANK() OVER(ORDER BY dte1) as Date_Nbr,
dte2
from ctsc_w.pete;

note RANK() gives
BB8179 04/17/11 1 04/02/11
BE7214 04/17/11 1 04/02/11
BD9607 04/17/11 1 04/02/11
BB6382 04/17/11 1 04/02/11
BB7942 04/17/11 1 04/02/11
BE7487 04/17/11 1 04/02/11
BE7488 04/18/11 7 04/02/11
BE2178 04/18/11 7 04/02/11
BE1618 04/18/11 7 04/02/11
BE7489 04/18/11 7 04/02/11
BE2179 04/18/11 7 04/02/11
BD9608 04/21/11 12 04/02/11
BE2180 04/21/11 12 04/02/11
BE8955 04/21/11 12 04/02/11
BE1696 04/21/11 12 04/02/11

Charles

On Mon, Mar 7, 2011 at 4:27 PM, Schutte, Michael D
<Michael_Schutte@xxxxxxxxxxxx> wrote:

Actually you are going to want  dense_rank


Select column1, column2,
dense_rank() over(partition by column3 order by
column2), column3 from qtemp/test

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Pete Helgren
Sent: Monday, March 07, 2011 3:41 PM
To: Midrange Systems Technical Discussion
Subject: Counting Occurrences with SQL

I am have a data set that looks like the following:

BB8179      04/17/11     04/02/11
BE7214      04/17/11     04/02/11
BD9607      04/17/11     04/02/11
BB6382      04/17/11     04/02/11
BB7942      04/17/11     04/02/11
BE7487      04/17/11     04/02/11
BE7488      04/18/11     04/02/11
BE2178      04/18/11     04/02/11
BE1618      04/18/11     04/02/11
BE7489      04/18/11     04/02/11
BE2179      04/18/11     04/02/11
BD9608      04/21/11     04/02/11
BE2180      04/21/11     04/02/11
BE8955      04/21/11     04/02/11
BE1696      04/21/11     04/02/11

What I would like to do is count the unique occurrences of the first
date column.  Something like:

BB8179      04/17/11   1  04/02/11
BE7214      04/17/11   1  04/02/11
BD9607      04/17/11   1  04/02/11
BB6382      04/17/11   1  04/02/11
BB7942      04/17/11   1  04/02/11
BE7487      04/17/11   1  04/02/11
BE7488      04/18/11   2  04/02/11
BE2178      04/18/11   2  04/02/11
BE1618      04/18/11   2  04/02/11
BE7489      04/18/11   2  04/02/11
BE2179      04/18/11   2  04/02/11
BD9608      04/21/11   3 04/02/11
BE2180      04/21/11   3  04/02/11
BE8955      04/21/11   3  04/02/11
BE1696      04/21/11   3  04/02/11

Actually there are more columns involved here but this data set
illustrates the challenge.  Can't seem to wrap my head around the whole
thing but I may need a subselect to get the count of the occurrences...

Thanks

--
Pete Helgren
Value Added Software, Inc
www.asaap.com
www.opensource4i.com

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