On Wed, 2005-03-16 at 18:58 +0100, Laurent Martelli wrote:
> Consider this query:
> SELECT distinct owner from pictures; 

The performance has nothing to do with the number of rows returned, but
rather the complexity of calculations and amount of data to sift through
in order to find it.

> Any ideas, apart from more or less manually maintaining a list of
> distinct owners in another table ?

This would be the proper thing to do, along with adding a foreign key
from pictures to the new owner structure for integrity enforcement.

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