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03/16/2009 at 04:13AM PDT, ID: 24233330
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8.2

Postgres get the row count from before the limit is applied

Asked by sl311 in PostgreSQL Database

To do pagination, I need to run two queries:

select count(*) from table where x=1;
select * from table where x=1 limit 30 offset 91;

To then display "< Items 91 to 120 > of 1932" for example in my pagination.

The queries take about 500ms and 1000ms respectively. Is there a way that I can avoid the first query to count the rows ? The second query knows how many rows there were before it applied the limit and offset (as I can see it in an query plan), but I'm not aware of any way I can get that information hence I need to use the count(*) query as well.

The count could also change between users pressing next or previous, hence I need to run it everytime they do, but just wondering if there's any way I could save that 500ms each time.

Thanks,
Mark
[+][-]04/27/09 12:41 AM, ID: 24239520

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Zone: PostgreSQL Database
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Solution Provided By: sl311
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03/16/09 04:21 AM, ID: 23896416

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[+][-]03/16/09 04:34 AM, ID: 23896490

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[+][-]03/16/09 06:16 AM, ID: 23897306

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