Saving loading time at counting rows

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I had this question, which I didn't really know where to ask, so I
thought to begin at this mailing list.

Very basicly said, I count the rows of a table which had approx 50000
or more rows.

The problem is, there is a notable difference in loading time with
other pages. Is there a technique to estimate the number of rows
instead of exactly couting them? So that it saves loading time.

For example, when you search with google, you get an estimate of the
number of results, how do they do this?

Maybe this is not a question for the PHP Mailing list, but if not
where is a better place to ask this?

regards,

Joep

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