[8i] can I use an analytical function, or do I need a subquery?

Hi all...

This should be a quick. I hope I can solve my problem with an analytic function, but I don't know if it's possible. Can I use a subquery if I have to, but I'd really rather not.

Here is a very simple version of what I'm trying to do:
CREATE TABLE     test123
(     field1          VARCHAR2(10)
,     field2          VARCHAR2(10)
,     my_date          DATE
);

INSERT INTO     test123
VALUES     ('value1', 'a',TO_DATE('12/31/1900','mm/dd/yyyy'));
INSERT INTO     test123
VALUES     ('value1', 'b',TO_DATE('01/02/2010','mm/dd/yyyy'));
INSERT INTO     test123
VALUES     ('value1', 'c',TO_DATE('01/05/2010','mm/dd/yyyy'));

INSERT INTO     test123
VALUES     ('value2', 'a',TO_DATE('12/31/1900','mm/dd/yyyy'));
INSERT INTO     test123
VALUES     ('value2', 'b',TO_DATE('01/01/2010','mm/dd/yyyy'));
INSERT INTO     test123
VALUES     ('value2', 'c',TO_DATE('01/15/2010','mm/dd/yyyy'));
I want the results:
FIELD1     FIELD2
--------------
value2     a
value2     b
value2     c
value1     a
value1     b
value1     c
I started with the following query:
SELECT     field1
,          field2
FROM     test123
ORDER BY     MIN(my_date)     OVER     (
                                             PARTITION BY     field1
                                             )                                -- removed DESC here
,               field2
But the problem is the database has a date of 31 December 1900 ' as default / initial for any date field. I don't want these default values taken into account in my calculation of min. I tried to put a WHERE clause in my analytical function [WHERE my_date <>TO_DATE (' 12/31/1900 ',' mm/dd/yyyy')], but I kept getting an error message "missing right parenthesis", so it seems that you can not have a WHERE clause here... or I'm just something wrong?

Moreover, it is a 8i database...

Edited by: user11033437 may 20, 2010 17:16: took the 'DESC' criteria out of my order by clause. In my real application, I need DESC, but not the example.

Hello

A WHERE clause excludes rows in the results set. Whenever you want you can have a WHERE clause that was more limited (for example, something that would simply exclude MIN calculating values in the ORDER BY clause), then think CASE:

SELECT       field1
,       field2
FROM       test123
ORDER BY  MIN ( CASE
              WHEN  my_date > TO_DATE ( '12/31/1900'
                             , 'MM/DD/YYYY'
                             )
              THEN  my_date
          END
           )     OVER     (PARTITION BY     field1)      DESC
,       field2
;

This puts the lines for "Value1" first.
The minimum my_date for "Value1" (after excluding the values of 1900) is later than the minimum for "Value2", so I think that you either made a mistake in the desired output, or you do not want sorted by descending order.

As always, thanks for the display of the data of the sample and the results so clearly.

Tags: Database

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