Oracle-L: RE: SQL Question

From: Kevin Lange <kgel_at_ppoone.com>
Date: Fri, 31 May 2002 08:28:45 -0800
Message-ID: <F001.0047103C.20020531082845@fatcity.com>

Try this

select a.f1, a.d1, a.d2
from
(select field1 f1,date1 d1,max(date2) d2 from temp group by field1,date1) a,
(select field1 f1,date1 d1,max(date2) d2 from temp group by field1,date1) b
where a.f1 = b.f1
and a.d1 < b.d1
and a.d2 > b.d2

-----Original Message-----
Sent: Friday, May 31, 2002 10:59 AM
To: Multiple recipients of list ORACLE-L

Hi,

I have a table with 1 field and 2 dates: field1, date1, date2. I need to find the max value of date2 for all the field1, date1 combinations. Then I want to join the table to itself on field1 and find all the rows where field1 matches, date1 < date1, and max(date2) > max(date2). I did this in 2 queries. First I created a view as follows:

create view v1 (f1, d1, d2)
as select field1,date1,max(date2) from table1 group by field1,date1;

Then I joined the 2 views together like this:

select a.f1,a.d1,a.d2 from v1 a, v1 b
where a.f1 = b.f1
and a.d1 < b.d1
and a.d2 > b.d2;

This worked fine, but I was wondering if there was a way to do this in one query without having to create a view.

Bill Carle
AT&T
Database Administrator
816-995-3922
wcarle_at_att.com

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Author: Carle, William T (Bill), ALCAS
INET: wcarle_at_att.com

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Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: Kevin Lange
INET: kgel_at_ppoone.com

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