Re: Sql result b where condition

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От A. Kretschmer
Тема Re: Sql result b where condition
Дата
Msg-id 20100125101327.GA5108@a-kretschmer.de
обсуждение исходный текст
Ответ на Sql result b where condition  ("ramasubramanian" <ramasubramanian.g@renaissance-it.com>)
Ответы Re: Sql result b where condition  (Matthew Wakeling <matthew@flymine.org>)
Список 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
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Andreas Kretschmer
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