HELP - Nested Case Question (Multiple Rows)

Question

OK, Now that the syntax has been corrected with the help of "Chanchal Wankhade" (Thank you very much!), I have an entirely new issue. I am sure this issue has to do with my case statement logic. I am getting multiple rows, when I am only looking for one. Here is my code:
SELECT
  CASE
    WHEN EP.PHYSICAL_DATE IS NULL
    THEN
      CASE
        WHEN EC.ORIGINAL_CONTRACT_START < ((SYSDATE) - 365)
        THEN 'NEEDS PHYSICAL'
        WHEN EC.ORIGINAL_CONTRACT_START < ((SYSDATE) - 330)
        THEN 'COMING UP'
        ELSE 'No'
        END
    WHEN EP.PHYSICAL_DATE IS NOT NULL
    THEN
      CASE
        WHEN MAX(EP.PHYSICAL_DATE) KEEP (DENSE_RANK LAST ORDER BY EP.PHYSICAL_DATE) < ((SYSDATE) - 365)
        THEN 'NEEDS PHYSICAL'
        WHEN MAX(EP.PHYSICAL_DATE) KEEP (DENSE_RANK LAST ORDER BY EP.PHYSICAL_DATE) < ((SYSDATE) - 330)
        THEN 'COMING UP'
        ELSE 'No'
        END
  END "Needs Physical?"
FROM AP AE
LEFT JOIN EMP_PHYSICAL EP
ON AE.EMP_ID = EP.EMP_ID
LEFT JOIN POSITION_OFFERED PO
ON AE.EMP_ID = PO.EMP_ID
LEFT JOIN EMP_CONTRACT EC
ON AE.EMP_ID         = EC.EMP_ID
WHERE PO.ACTUAL_END IS NULL
AND (EP.PHYSICAL     = 1
OR EP.PHYSICAL      IS NULL)
AND :P71_EMP_ID = AE.EMP_ID
GROUP BY EP.PHYSICAL_DATE, EC.ORIGINAL_CONTRACT_START;The OUTPUT is:
Needs Physical?
Row 1 NEEDS PHYSICAL
Row 2 No
However, only one of these rows should be the output, which is "No". How do you get a nested case statement to evaluate to one result, instead of multiple? I'm quite sure it is in the logic. To spell it out, this is what I am trying to accomplish with the above code:
If the "EP.PHYSICAL_DATE" is null, then use these sets of formula's to evalute the output, BUT if the "EP.PHYSICAL_DATE" is not null, then use these set's of formula's to evaluate the output.
As it stands now, it appears as if my nested case statement is doing exactly what I told it to do, which is to evaluate both conditions, and output both.
Any help would be appreciated. Thanks.
Aqua
Edited by: AquaNX4 on Mar 26, 2013 6:30 AM

Answer 1

If you define your service_level as a table then it will be much easier.
with service_level
as
select 'ALL' parent_lvl, 'Sergeant' srv_lvl from dual union all
select 'ALL', 'Bonus I' from dual union all
select 'ALL', 'Deputy Bailiff' from dual union all
select 'ALL', 'Deputy Lockup' from dual union all
select 'ALL', 'Deputy Bailiff Security' from dual union all
select 'ALL', 'Custody Assistant' from dual union all
select 'ALL', 'Security Officer' from dual union all
select 'ALL', 'Security Assistant' from dual union all
select 'ALL', 'Security Officer and Security Assistant' from dual union all
select 'ALL', 'Private Security' from dual union all
select 'All Deputies', 'Deputy Bailiff' srv_lvl from dual union all
select 'All Deputies', 'Deputy Bailiff Security' from dual union all
select 'All Deputies', 'Deputy Lockup' from dual union all
select 'All Sworn', 'Sergeant' srv_lvl from dual union all
select 'All Sworn','Bonus I' from dual union all
select 'All Sworn','All Deputies' from dual union all
select 'All Sworn','Deputy Bailiff' from dual union all
select 'All Sworn','Deputy Lockup' from dual union all
select 'All Sworn','Deputy Bailiff Security' from dual
select *
  from in_service
where rank IN (
          select srv_lvl
            from service_level
           where upper(parent_lvl) = upper(:SL)
              or upper(srv_lvl) = upper(:SL)
               )