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help / color / mirror / Atom feedFrom: Adrian Klaver <adrian.klaver@aklaver.com>
To: emilu@encs.concordia.ca
To: pgsql-sql@postgresql.org
Subject: Re: query based on row number for psql8.3
Date: Wed, 23 Mar 2016 11:07:47 -0700
Message-ID: <56F2DB73.2070703@aklaver.com> (raw)
In-Reply-To: <56F2D9C4.9010304@encs.concordia.ca>
References: <56F2D9C4.9010304@encs.concordia.ca>
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On 03/23/2016 11:00 AM, Emi wrote:
> Hello,
>
> For psql8.3, is there a simple way to query based on row number please?
First FYI, 8.3 is 3 years past its end of life.
Second, Postgres does not have a built in row_num. Anything that could
be cobbled together would be dependent on the ordering specified.
So what exactly are you trying to do?
In other words what is row_num supposed to represent?
>
> For example,
>
> select case
> when row_num=1 THEN t1.tot_hr
> ELSE t1.tot_hr -
> t1.pre_hr
> END
> FROM t1 ;
>
>
>
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
--
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To: pgsql-sql@postgresql.org
Cc: adrian.klaver@aklaver.com, emilu@encs.concordia.ca
Subject: Re: query based on row number for psql8.3
In-Reply-To: <56F2DB73.2070703@aklaver.com>
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