From: Stephen Tahmosh <stahmosh@shieldsrx.com>
To: Stephen Tahmosh <stahmosh@shieldsrx.com>
To: emilu@encs.concordia.ca <emilu@encs.concordia.ca>
To: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: query based on row number for psql8.3
Date: Wed, 23 Mar 2016 18:13:15 +0000
Message-ID: <DM2PR0701MB1295F2FFD6EF372E3D89FE63C4810@DM2PR0701MB1295.namprd07.prod.outlook.com> (raw)
In-Reply-To: <DM2PR0701MB12952B5B882790545890C92DC4810@DM2PR0701MB1295.namprd07.prod.outlook.com>
References: <56F2D9C4.9010304@encs.concordia.ca>
<DM2PR0701MB12952B5B882790545890C92DC4810@DM2PR0701MB1295.namprd07.prod.outlook.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>
A "goggle" of row_number() function for postgresql seems to indicate its only available in 8.4 and above :-(
-----Original Message-----
From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Stephen Tahmosh
Sent: Wednesday, March 23, 2016 2:10 PM
To: emilu@encs.concordia.ca; pgsql-sql@postgresql.org
Subject: Re: [SQL] query based on row number for psql8.3
Row_number is an "analytic" function, used in conjunction with the "partition by"
Ror_number is a logical concept so depends on the "order by" component of the "partition by" clause
You need to wrap your query with row_number in an outer query and apply thye case statement to the outer query.
-----Original Message-----
From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Emi
Sent: Wednesday, March 23, 2016 2:01 PM
To: pgsql-sql@postgresql.org
Subject: [SQL] query based on row number for psql8.3
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 ;
--
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 CONTAIN INFORMATION THAT IS PRIVILEGED, CONFIDENTIAL AND EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. If you are not the intended recipient, your use of this message for any purpose is strictly prohibited. If you have received this communication in error, please delete the message without making any copies and notify the sender so that we may correct our records. Thank you.
--
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 CONTAIN INFORMATION THAT IS PRIVILEGED, CONFIDENTIAL AND EXEMPT FROM DISCLOSURE UNDER APPLICABLE LAW. If you are not the intended recipient, your use of this message for any purpose is strictly prohibited. If you have received this communication in error, please delete the message without making any copies and notify the sender so that we may correct our records. Thank you.
--
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: stahmosh@shieldsrx.com, emilu@encs.concordia.ca
Subject: Re: query based on row number for psql8.3
In-Reply-To: <DM2PR0701MB1295F2FFD6EF372E3D89FE63C4810@DM2PR0701MB1295.namprd07.prod.outlook.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox