Case or Decode ?

Question

Oracle 11.2.3.0
Ok, here is the situation. on a view, there is a column called 'DUE_DATE'. What I want to do is via some logic (using case or decode I presume) depending on how many days there is between sysdate (todays date) and the DUE_DATE. to output a value .. So as an example, what I mean is if the amount of days from sysdate to the DUE_DATE is lets say, 20 days, one the report, I was it to say "1-30d"..
Todays date= due date + 1 to 30days = “1-30d”
Todays date= due date + 31 to 60days = “31-60d”
Todays date= due date + 61 to 90days = “61-90d”
Todays date= due date +>90days =”>90d”
How can I achieve this.. Any help, assistance would be greatly appreciated.

Answer 1

Hi,
Here's one way
CASE
    WHEN  due_date < SYSDATE - 90  THEN  '>90d'
    WHEN  due_date < SYSDATE - 60  THEN  '61-90d'
    WHEN  due_date < SYSDATE - 30  THEN  '31-60d'
    WHEN  due_date < SYSDATE -  1  THEN  '1-30d'
                                   ELSE  NULL   -- or whatever
END
Depending on your requirements, you may want to use TRUNC (SYSDATE) wherever I used SYSDATE above.
ELSE NULL is the default.  If you want the expression to return NULL when due_date is later than SYSDATE - 1 (or when due_date is NULL) then you can leave out the ELSE clause.