Craig James <craig_ja...@emolecules.com> wrote: 
> Suppose I have a large table with a small-cardinality CATEGORY
> column (say, categories 1..5).  I need to sort by an arbitrary
> (i.e. user-specified) mapping of CATEGORY
 
There was a recent thread discussing ways to do that:
 
http://archives.postgresql.org/pgsql-admin/2009-07/msg00016.php
 
-Kevin

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