On Tue, Oct 5, 2010 at 10:33 PM, Thomas Guettler <h...@tbz-pariv.de> wrote:
> Hi,
>
> just a guess: Counting is slow, since it needs to check all rows. Explained 
> here:
>

Actually counting was pretty fast. As I said when I created a table
using the subquery that went pretty fast. The update was the slow
part.

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