On Thu, Jul 9, 2009 at 5:26 PM, Craig James<craig_james@xxxxxxxxxxxxxx> 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, something like this: > > 1 => 'z' > 2 => 'a' > 3 => 'b' > 4 => 'w' > 5 => 'h' > > So when I get done, the sort order should be 2,3,5,4,1. > > I could create a temporary table with the category-to-key mapping, but is > there any way to do this in a single SQL statement? > you can create translation table, join it, and sort by its key. -- GJ -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
