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Re: Why count(*) doest use index?

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On 03/05/11 2:05 PM, Allan Kamau wrote:
Is it possible in theory to efficiently perform count the primary or
unique indices underlying data structures, regardless whether there is
a WHERE clause detailing filtration base on values from such index or
not?

indexes are not exact, due to possibly constant changes in the current number of visible elements in the relation.





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