Re: can someone help me to make a sql more pretty and more concise?

From: Russell Smith <mr-russ(at)pws(dot)com(dot)au>
To: Yi Zhao <yi(dot)zhao(at)alibaba-inc(dot)com>
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: can someone help me to make a sql more pretty and more concise?
Date: 2008-11-13 08:27:53
Message-ID: 491BE509.5020006@pws.com.au
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

Yi Zhao wrote:
> I want to select some column(a, b) from the table with the specified
> condition, so, i can do like this:
> select a, b from mytable where id = (select id from temptable where
> tname = 'df' ) and stype = 'def' and range = 'afk'
>
How about;

SELECT a, b, count(1), sum(c) FROM mytable WHERE id = (select id from
temptable where
tname = 'df' ) and stype = 'def' and range = 'afk' GROUP BY 1,2;

Russell.
> !!!!but, I want the result contains a sum(c) and a count value extra,
> so, I use the sql below:
> select a, b,
> (select count(1) from mytable where id =
> (
> select id from temptable where tname = 'df'
> ) and stype = 'def' and range = 'afk'
> ),
> (select sum(c) from mytable where id =
> (
> select id from temptable where tname = 'df'
> ) and stype = 'def' and range = 'afk'
> )
> from mytable where id = (
> select id from temptable where tname = 'df'
> ) and stype = 'def' and range = 'afk';
>
> can someone help me to make this sql statement above more pretty and more concise?
>
>
>

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Markus Wollny 2008-11-13 09:32:42 Re: Suboptimal execution plan for simple query
Previous Message Klint Gore 2008-11-13 06:00:31 Re: exception