Question

I have a query with a limit and an offset. For example:

select * from tbl
limit 10 offset 100;

How to keep track of the count of the records, without running a second query like:

select count(*) from tbl;

I think this answers my question, but I need it for PostgreSQL. Any ideas?

Answer 1

I have found a solution and I want to share it. What I do is – I create a temp table from my real table with the filters applied, then I select from the temp table with a limit and offset (no limitations, so the performance is good), then select count(*) from the temp table (again no filters), then the other stuff I need and last – I drop the temp table.

select * into tmp_tbl from tbl where [limitations];
select * from tmp_tbl offset 10 limit 10;
select count(*) from tmp_tbl;
select other_stuff from tmp_tbl;
drop table tmp_tbl;