Michael Fuhr wrote:
On Mon, Nov 21, 2005 at 11:03:22AM -0500, Berend Tober wrote:
I'm interested in defining a covariance aggregate function.
I think aggregates must take a single value, so the above won't
work as written. However, in PostgreSQL 8.0 or later you could
define the aggregate's base type to be a composite type
Thanks. I briefly explored something like that, using the existing POINT
data type, but didn't press it too far, pending mailling list advice.
Regards,
Berend
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