How Can I Replace a Value

Question

Hi guys,
Perhaps, you can help in this query,
SELECT Br FROM crm where project = :P2_Project
:P2_Project : is " a value in a list of values Item" that contains X, Y, Z
Only if the value "X" is picked, then It should be replace for another value such as "A"; then it should be compared against the values of the project column.
How can I perform that task...? I hope my question is clear.....
Best Regards,
Fateh

Answer 1

Hi,
What you posted is equivalent to:
SELECT distinct
     br
FROM      crm
where      project = CASE
               WHEN  :P2_PROJECT IN      
                    ( 'ET-H'
                    , 'ET-B'
                    , 'ET-C'
                    , 'ET-D'
                    , 'ET-E'
                    , 'ET-F'
                    , 'ET-J'
                    , 'ET-K'
                    , 'ET-M'
                    , 'ET-L'
               THEN  'ET'
               ELSE  :P2_project
           END
;It's a little less coding, and (I think) clearer.
In Oracle 10 (and up) you can do this, too:
SELECT distinct
     br
FROM      crm
where      project = CASE
               WHEN  REGEXP_LIKE ( :P2_PROJECT
                           , '^ET-[HBCDEFJKML]$'
               THEN  'ET'
               ELSE  :P2_project
           END
;but, if the list of values ever changes so that it won't follow such a clear pattern, then it might be harder to maintain.