Plsql procedure containing select statement to fill page items

Question

I would like to fill items :P200_A and :P200_B and so on
with the result of a SELECT which depends on the different values of many select lists.
E.G. :P200_list_alpha with the list of values
STATIC:less than 10;less,equal than 10;equal,above 10;above,indifferent;indiff
:P200_list_beta with the list of values
STATIC:active;active,passiv;passiv,excluded;excluded
How do I write the select statement ? I think it has to be executed in an anonymous PLSQL Procedure (after submit).
What is a convenient way to write the select statement ?
I could imagine to use lots of IF , ELSIF, ELSE statements and in each branch (here 12 ) the whole/complet SELECT statement is written.
How to solve this problem in an elegant way ?
In my opinion the CASE statement could be helpful, but how to use it in the WHERE clause with this nested conditions ?

Answer 1

I think I got it:
SELECT col1, col2, col3, ...
INTO :P200_A , :P200_B , ....
FROM mytable_1, mytable_2
WHERE mytable_1.col1 = mytable_2.col1
AND (
CASE
WHEN :P200_LIST_ALPHA = 'less' AND NVL(TO_COL_WITH_ALPHA, 0) < 10 THEN 1
WHEN :P200_LIST_ALPHA = 'equal' AND NVL(TO_COL_WITH_ALPHA, 0) = 10 THEN 1
WHEN :P200_LIST_ALPHA = 'above' AND NVL(TO_COL_WITH_ALPHA, 0) > 10 THEN 1
WHEN :P200_LIST_ALPHA = 'indiff' THEN 1
ELSE 0
END = 1 )
AND
( CASE
WHEN :P200_LIST_BETA = 'active' AND TO_COL_WITH_BETA IN ( 'a', 'A', 'akt', 'AKT' ) THEN 1
WHEN :P200_LIST_BETA = 'passive' AND TO_COL_WITH_BETA IN ( 'p', 'P' ) THEN 1
WHEN :P200_LIST_BETA = 'excluded' AND TO_COL_WITH_BETA = 'X' THEN 1
ELSE 0
END = 1 )
;Edited by: wucis on Oct 24, 2011 4:09 PM