Oops. Sorry...incomplete query...missed the dateinserted column...try this
select prev.dateinserted "date", prev.status "orig_status",
curr.dateinserted "change_date", curr.status "new_status"
from
(select rank() over (order by dateinserted asc) id,
primarykey, status, dateinserted from table) curr,
(select rank() over (order by dateinserted asc) id,
primarykey, status, dateinserted from table) prev
where curr.id-1 = prev.id
and curr.status <> prev.status;
--
Maria Aurora VT de la Vega
Oracle DBA
Philippine Stock Exchange, Inc.
"If you don't risk anything, you risk even more."
Mark Richard wrote:
> Hi All,
>
> This is a question for those who like writing tricky queries as a single
> SQL...
>
> Assume I have a table with the following structure (imaginary table to keep
> example simple):
>
> primarykey number(8)
> status char(1)
> dateinserted date
> <many other fields which are insignificant>
>
> A row is inserted into this table any time one, or more, fields change for
> the record. What I'm trying to determine is the "dateinserted" for each
> time the value of "status" changed - remembering that there might be 50
> records for the primary key and five of those include a change in status -
> I want the dates of those five records (plus the value of status at each
> date).
>
> Is there any way to achieve this within a single SQL statement? I realise
> that I could cursor through each record in date order and use a variable to
> store the previous value of status - but I'd love to compress this to a
> single statement. I've seen the syntax "OVER" used in some queries and
> suspect this may be useful but I really don't understand it enough to know.
>
> Thanks in advance if you can help me on this one,
>
> Mark.
>
> PS: Sorry if this appears more than once - I've been getting mail server
> failures all day
>
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Mark Richard
> INET: mrichard_at_transurban.com.au
>
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--
Maria Aurora VT de la Vega
Oracle DBA
Philippine Stock Exchange, Inc.
"If you don't risk anything, you risk even more."
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Maria Aurora VT de la Vega
INET: mtdelavega_at_pse.org.ph
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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Received on Thu Jan 23 2003 - 22:08:58 CST
