Обсуждение: descending indexes

I am attempting to port an application that makes extensive use of being
able to scroll forwards or backwards through a large database from a
given, user-defined point  where the key is a CHAR(15) user-defined
field, arbitrarily & frequently inserted & deleted.  Creating an index
on the field speeds up the scroll forwards, but I'm having to jump
through hoops to scroll backwards.  I have searched and cannot find any
reference to a simple method to find the previous key using the index.
Any suggestions?

steve

Steve Owen <steve@keymarksystems.com> writes:
> Creating an index
> on the field speeds up the scroll forwards, but I'm having to jump
> through hoops to scroll backwards.

Why?  A cursor would work in either direction, and so can any other
method I can think of.  How are you trying to do this, exactly?

            regards, tom lane