Re: reg:Query - Mailing list pgsql-admin

Depends on which version of Postgres you’re using (pre-8.0 or post-8.0)

I think the format changed from v8.0 onwards.  So, for example, post-8.0:

       SELECT email_address FROM account_details ORDER BY address_id LIMIT 1
OFFSET 0;

Will bring back the first row.  The following will bring back the next and
so on:

    SELECT email_address FROM account_details ORDER BY address_id LIMIT
1 OFFSET 1;

Pre-8.0 the queries would be:

       SELECT email_address FROM account_details ORDER BY address_id LIMIT
1, 0;
       SELECT email_address FROM account_details ORDER BY address_id LIMIT
1, 1;

Note LIMIT 1, 0 (and LIMIT 1 OFFSET 0) is the same as LIMIT 1

Andy


________________________________________
From: sandhya [mailto:sandhyar@amiindia.co.in]
Sent: 16 May 2006 2:28 pm
To: andy.shellam@mailnetwork.co.uk
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] reg:Query

yes..I got it.
SELECT .................... LIMIT x OFFSET y.Am i right?
----- Original Message -----
From: Andy Shellam
To: 'sandhya'
Cc: pgsql-admin@postgresql.org
Sent: Tuesday, May 16, 2006 6:35 PM
Subject: FW: [ADMIN] reg:Query

Actually, just realized, this depends on your PGSQL version. 

The older format (pre-8.0 I believe) is SELECT ….. LIMIT x, y  (where x is
the number of rows to fetch, and y is the offset (ie. Select x number of
rows, starting from row y.)

Andy

________________________________________
From: pgsql-admin-owner@postgresql.org
[mailto:pgsql-admin-owner@postgresql.org] On Behalf Of Andy Shellam
Sent: 16 May 2006 1:57 pm
To: 'sandhya'
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] reg:Query

SELECT ….. LIMIT 1

Will get the first row in the dataset.  Then to fetch the next row, you can
do SELECT …… LIMIT 1 OFFSET 1 (will get the 2nd record) and so on.
(replace ….. with your conditions, LIMIT must come at the end of the query)

Andy

________________________________________
From: pgsql-admin-owner@postgresql.org
[mailto:pgsql-admin-owner@postgresql.org] On Behalf Of sandhya
Sent: 16 May 2006 11:47 am
To: Postgres
Cc: sandhya
Subject: [ADMIN] reg:Query

Hi
 Is there any query for possibility of getting only one row at a time in a
group of records?
 
With distinct rows & Columns my query has to return only one record at a
time with out any condition.Will it be possible?
 
Thank you,
Sandhya
 


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