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