sql - Oracle dynamic DESC and ASC in order by

Question

Order by is dynamic but the sort order is static.

SELECT ...
Order By CASE WHEN InputParam = 'PRICE' THEN OFFER_PRICE END DESC,
         CASE WHEN InputParam = 'ENDING SOON' THEN EXPIRY_DATE END DESC, 
         CASE WHEN InputParam = 'DISCOUNT' THEN DISC_PERCENTAGE END DESC,
         CASE WHEN InputParam = 'SAVING' THEN SAVING END DESC

Now I need to make sure that the sort order is also dynamic. Is there some way to make sort order dynamic in the above query?

Answer 1

If you also want to make the sort order (ASC/DESC) dynamic, you could do the following:

SELECT ...
Order By CASE WHEN InputParam = 'PRICE' THEN l_so * OFFER_PRICE END,
         CASE WHEN InputParam = 'ENDING SOON' 
              THEN l_so * (SYSDATE - EXPIRY_DATE) END, 
         CASE WHEN InputParam = 'DISCOUNT' THEN l_so * DISC_PERCENTAGE END,
         CASE WHEN InputParam = 'SAVING' THEN l_so * SAVING END

with a variable l_so that contains 1 or -1 depending upon which sort order you want.