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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
20090824-EE-VQP-74 - Hierarchy / EE_QW_3_20080625