From: "Tomasz Myrta" <jasiek@klaster.net>
To: "A.M." <agentm@cmu.edu>, pgsql-sql@postgresql.org
Subject: Re: order by date desc but NULLs last
Date: Mon, 10 Feb 2003 07:12:11 +0800
Message-Id: <20030210071211.M27958@klaster.net>
In-Reply-To: <F427C52A-3C7D-11D7-A094-0030657192DA@cmu.edu>
References: <F427C52A-3C7D-11D7-A094-0030657192DA@cmu.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2

> I have a simple query that sorts by descending date but the NULL 
> dates show up first. Is there a way I can sort so they come last 
> without sorting ascending?
> 
> SELECT submittime,score,gradedtime FROM student_gradedmaterial WHERE 
> gradedmaterialid=3 and studentid=102 order by gradedtime desc;
> 
>       submittime      | score |         gradedtime
> ---------------------+-------+----------------------------
>   2003-01-30 22:56:38 |       |
>   2003-01-31 03:42:29 |    99 | 2003-02-06 14:21:43.043587
> 
> but what I want is all the graded items first in gradedtime desc and 
> NULL afterwards. I do need to keep the NULL score rows. (So I get 
> the latest submitted grade for the assignment but also any ungraded 
> submission information.)
> 
> Thanks for any advice.
>  ><><><><><><><><><
> AgentM
> agentm@cmu.edu

order by gradetime is null asc, gradetime desc;

Regards,
Tomasz Myrta