"Donald Fraser" <demolish@cwgsy.net> writes:
> 2) One of my queries does an ORDER BY on a column that is of type BOX.
> This query no longer runs and returns the following error message:
> ERROR: could not identify an ordering operator for type box
What are you expecting that to do? Boxes have no natural linear
ordering.
> my_box[0] returns a point and my_box[0][0] is not recognised (I tried various
> other forms but to no avail).
I think (my_box[0])[0] would work to get the lower x-coordinate, if
that's what you're after.
regards, tom lane