Re: query based on row number for psql8.3

-----Original Message-----
From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Rob Sargent
Sent: Wednesday, March 23, 2016 2:27 PM
To: pgsql-sql@postgresql.org
Subject: Re: [SQL] query based on row number for psql8.3



On 03/23/2016 12:00 PM, Emi wrote:
> Hello,
>
> For psql8.3, is there a simple way to query based on row number please?
>
> For example,
>
> select  case
>                     when row_num=1 THEN    t1.tot_hr
>                     ELSE t1.tot_hr - t1.pre_hr
>           END
> FROM  t1 ;
>
>
>
>
>
I seem to recall other posts from condordia:  Someone needs to take of
their skates and update postgres!

[ST]
I'm not  sure if this link works, as I don't have access to 8.3
http://postgresql.nabble.com/How-to-realize-ROW-NUMBER-in-8-3-td4328448.html

If this works, then wrap the query with a main query that uses "rownum" in the case statement.

STeve



--
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql
THIS MESSAGE (AND ALL ATTACHMENTS) IS INTENDED FOR THE USE OF THE PERSON OR ENTITY TO WHOM IT IS ADDRESSED AND MAY
CONTAININFORMATION THAT IS PRIVILEGED, CONFIDENTIAL AND EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. If you are not the
intendedrecipient, your use of this message for any purpose is strictly prohibited. If you have received this
communicationin error, please delete the message without making any copies and notify the sender so that we may correct
ourrecords. Thank you.