Problem with the syntax Decode

Question

Hi, I am trying to decode if it has RBB, VALUE is 'Y', IF it is blank or different value value is 'N'
first query:
select distinct a.emplid, (DECODE (NVL ( b.SRVC, 'RBB'), 'RBB', 'N','Y')
from prog a, srvci b make it 'N'
where a.emplid = b.emplid(+)
The result is
emplid srvc
00001 Y
00002 N
00002 Y
00008 Y
Problem: user 00002 has RBB and other service values, as the result it appears on my report twice.
Do you know how to modify the code to eliminate the duplicates
Thank you

Answer 1

my suggestion would be not to join the two table but to use a subselect.
maybe you can get rid of the distinct during this too, but it depends on your data.
untested
select distinct a.emplid, nvl((select 'Y' from srvci b where a.emplid = b.emplid and  b.SRVC='RBB' and rownum = 1),'N') srvc
from prog aJust noticed that the rowum might give some trouble. I used it to avoid an oracle error if some row in a is conencted to two RBB rows in b.
If the upper doesn't work then you can also use the case expression and an exists clause.
example untested
select a.emplid,
        case when exists (select 'Y' from srvci b where a.emplid = b.emplid and  b.SRVC='RBB')
        then 'Y'
        else 'N'
        end as srvc
from prog aEdited by: Sven W. on Feb 24, 2009 5:39 PM