El Dom 26 Jun 2005 07:39, Ross Honniball escribió:
> Hi All,
>
> I use
>
> SELECT COUNT(*) FROM whatever WHERE whatever
>
> to determine how many rows a particular query will return (then use this
count to assist with pagination).
>
> The problem is that this does not work if the query contains a GROUP BY
statement as, of course,
> the query will return many rows each with a count by each grouping.
>
> Does anyone know an efficient way to determine the number of ROWS a query
with a GROUP BY
> statement will return (without just executing the entire query with no LIMIT
statement)?
You are not stating which database you are working with, but I would do this
(don't know if it's efficient, but it'll work):
SELECT sum(count) FROM
(SELECT COUNT(*) AS count FROM whatever WHERE whatever) t1;
Hope it helps.
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Martín Marqués | Programador, DBA
Centro de Telemática | Administrador
Universidad Nacional
del Litoral
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