Обсуждение: Count Total on a limited query?

Hi group,

I've implemented a couple of search queries, to prevent too many results
transferring/getting displayed I use a LIMIT. Now I would like to
display the total numbers found on the query (discarding the limit).

Is this possible in a nice manner?
I thought up the following:
1. Implementing the limit system in PHP
Con: Too much work for something this elementary
2. Executing an extra search query which only counts
Con: An extra query which feels unnecessary
3. Using a subselect which only counts
Con: although it gives a nice result, and isn't much work, the query
will be executed for each record and therefore not an option.


I hope this can be done using PostgreSQL.

Thank you,
Koen Antonissen

I don't think an extra count query is that much of a work to the system. A
counting on the indexed column is very fast. 



On Wed, 16 Jan 2002 13:55:18 +0100
"Koen Antonissen" <Koen@Cee-Kay.net> wrote:

> Hi group,
> 
> I've implemented a couple of search queries, to prevent too many results
> transferring/getting displayed I use a LIMIT. Now I would like to
> display the total numbers found on the query (discarding the limit).
> 
> Is this possible in a nice manner?
> I thought up the following:
> 1. Implementing the limit system in PHP
> Con: Too much work for something this elementary
> 2. Executing an extra search query which only counts
> Con: An extra query which feels unnecessary
> 3. Using a subselect which only counts
> Con: although it gives a nice result, and isn't much work, the query
> will be executed for each record and therefore not an option.
> 
> 
> I hope this can be done using PostgreSQL.
> 
> Thank you,
> Koen Antonissen
> 
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-- 
Wei Weng
Network Software Engineer
KenCast Inc.