Skip site navigation (1) Skip section navigation (2)

Re: Sql result b where condition

From: "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Sql result b where condition
Date: 2010-01-25 10:13:27
Message-ID: 20100125101327.GA5108@a-kretschmer.de (view raw or flat)
Thread:
Lists: pgsql-performance
In response to ramasubramanian :

Please, create a new mail for a new topic and don't hijack other
threads.


> Hi all,
>    I have a table emp. using where condition can i get the result 
> prioritized.
> Take the example below.
> 
> select ENAME,ORIG_SALARY from employee where (ename='Tom' and 
> orig_salary=2413)or(orig_salary=1234 )
> 
> if the fist condition(ename='Tom' and orig_salary=2413) is satified then 10 
> rows will be returned, for the second condition (orig_salary=1234 ) there 
> are 20 rows will be returned.
> The order of display should be
> 
> The first 10 rows then
> next 20 rows.
> Thanks & Regards,
> Ram

For instance:

select ENAME,ORIG_SALARY, 1 as my_order from employee where (ename='Tom' and
orig_salary=2413) union all select ENAME,ORIG_SALARY, 2 employee where
(orig_salary=1234 ) order by my_order.

other solution (untested):

select ENAME,ORIG_SALARY, case when (ename='Tom' and orig_salary=2413)
then 1 else 2 end as my_order from employee where (ename='Tom' and
orig_salary=2413)or(orig_salary=1234 ) order by my_order;


Regards, Andreas
-- 
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431  2EB0 389D 1DC2 3172 0C99

In response to

Responses

pgsql-performance by date

Next:From: Richard HuxtonDate: 2010-01-25 10:54:30
Subject: Re: Data Set Growth causing 26+hour runtime, on what we believe to be very simple SQL
Previous:From: ramasubramanianDate: 2010-01-25 09:36:25
Subject: Sql result b where condition

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group