"SunWuKung" <Balazs(dot)Klein(at)gmail(dot)com> writes:
> Is there an easy way to have the corr() statistical function in 8.1?
Nothing that's likely to be easier than updating to 8.2 ... and given
the lack of multiple-input aggregates in 8.1, anything you did would
be a serious kluge anyway.
regards, tom lane