Replace CASE with DECODE

Guys,
I want to replace CASE statement with DECODE. How ?
case when msg.is_swap = 'Y' and msg.buy_sell = 1 then 'SO'
when msg.is_swap = 'Y' and msg.buy_sell = 0 then 'SI'
else ''
end As TransactionType
How should i implement DECODE function to do the above one ?
Regards
Karthik

Karthik_ORACLE wrote:
Thanks for all your replies.
As i am new to ORACLE, one of my friend told me that DECODE will be faster than CASE. is it true ? Thats why i wanted to convertNeed to be proved ! See the following thread :
Re: what is better and fast to use between decode and case
Oracle version dependant, plateform dependant, and still the difference is near to 0.
Nicolas.

Similar Messages

Error while replacing IF statements with DECODE function in procedure

Hi All,
I have created a procedure which has nested IF statements. Now I want to replace the IF statements with DECODE functions to improve performance.
Procedure:
IF (var_int_sev = '0')
THEN
var_sev := '2';
ELSE
SELECT sev
INTO var_int_sev
FROM errorconfig
WHERE errorcode = var_errorcode;
var_sev := var_int_sev;
END IF;
I converted the above IF statement into DECODE function as mentioned below:
var_Sev := DECODE(var_int_sev,0,2,SELECT severity FROM errorconfig WHERE errorcode=var_ErrorCode)
But it throws below error at the select statement used inside DECODE.
Error(58,51): PLS-00103: Encountered the symbol "SELECT" when expecting one of the following: ( - + case mod new not null others <an identifier> <a double-quoted delimited-identifier> <a bind variable> avg count current exists max min prior sql stddev sum variance execute forall merge time timestamp interval date <a string literal with character set specification> <a number> <a single-quoted SQL string> pipe <an alternatively-quoted string literal with character set specification> <an alternativ
Can someone help me in converting the IF to DECODE in the above case. Also how can we use a select statement inside decode.

instead of trying to rewrite all your code and hoping that the performance will be better, it's a better option to investigate and find out which part of your application is slow
read this:
When your query takes too long ...

CASE vs DECODE - CASE with SUM and All in Page Item is non aggregable

Hi,
I'm using Discoverer 9.0.4.
After switching calculations from DECODE to CASE
I found out that case gives a non aggregable result when using a Page Item and selecting <All>.
The calculations
(SUM x) / (SUM y)
or
(x SUM) / (y SUM)
where x and y are variables, work fine with page item <All>.
But for example:
CASE WHEN 1=2 THEN 1 ELSE (SUM x) / (SUM y) END
gives non-aggregable.
The same code works with DECODE:
DECODE(1,2,1,(SUM x) / (SUM y))
and is aggregable.
Does anyone know a reason or a way to make it work with CASE?
Thanks,
Joao Noronha
P.S.: I wanted <= comparisons and CASE is the best in simplicity,
but now I know I can do it with DECODE, still looking ok using LEAST instead of ABS of the difference.

Hi there
I think therefore you have answered your own question and determined that using CASE in aggregations is not a good idea. I only threw out the two CASE options as ideas not as solutions, just in case (pardon the pun) one of these worked in your situation.
Your comment I must say that if it worked it would give a wrong result (the sum of the divisions is not the same as the division of the sums) may give the wrong answer in your case but may be correct in others. It just depends how the items in the folder have been set up. I agree though that SUM(x) / SUM(y) will more often than not give the right answer.
This discussion about DECODE vs CASE has been going on ever since Oracle introduced CASE as a means of placating a younger breed of user who needed an IF..THEN...ELSE construct and could not get their minds around the intricacies of DECODE. The DECODE is a much more reliable function than CASE because it has been around for a long time allowing Oracle plenty of opportunity to iron the bugs out of it. If I get a chance I will always use a DECODE whenever aggregations are required. However, when no aggregations are in use then I'll use CASE, simply because it's easier for users to work with.
Unfortunately, users need to work with aggregations and so I don't see any alternative to Plus users having to learn DECODE. Whenever I teach Plus I always teach the users both CASE and DECODE but point out that DECODE has fewer issues that CASE. Oh, and talking of issues, try getting the THEN and ELSE components to return a different datatype. CASE has a fit and will not compile.
Best wishes and glad you got your issue solved - you did right?
Regards
Michael

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Hi friends,
i need to refer an image to the corresponding blob content in my report for each and every row. i tried with case or decode but it is helpless as the case and decode does not support BLOB format, instead what is the other optional i can use inorder to solve the problem
SELECT
decode(attachment,(select attachment from it_issues where lower(name) like '%txt%') ,
       '<img src="#WORKSPACE_IMAGES#Notepad.jpg">',
       (select attachment from it_issues where lower(name) like '%pdf%'),
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       '<img src="#WORKSPACE_IMAGES#Excel.png">',
        (select attachment from it_issues where lower(name) like '%html%'),
       '<img src="#WORKSPACE_IMAGES#Html.bmp">',
        (select attachment from it_issues where lower(name) like '%sql%'),
       '<img src="#WORKSPACE_IMAGES#Notepad.jpg">',
        (select attachment from it_issues where lower(name) like '%ppt%'),
       '<img src="#WORKSPACE_IMAGES#powerpoint.jpg">',
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        (select attachment from it_issues where lower(name) like '%doc%'),
       '<img src="#WORKSPACE_IMAGES#word.bmp">', null) Attachment
FROM   it_issuesAbove is My code which is not sufficient to use, any replacement to it.. It will be very helpful for me
Regards,
Mini

Hi metzguar,
Thanks for the reply my image is stored in the attachment column but that image name is stored in filename column in my table, so i cannot refer attachment = txt, because the image name(txt)is stored in another column filename.
But i need to show the image icon in my attachment column where the image is storing. That is the problem for me.
Thanks
Regards,
Mini

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id never ever myself consider time machine a genuine data backup tool. though most do consider it as such
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In first place I found that there's a bug (13054445). I download and ran the patch, then I tried editing data format in my analysis column and in BI Answers and this worked. The 0 displays correctly, but in the report it's still not displaying.
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IFNULL(column,0)
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Hi,
Following on with this post, I followed the document posted and the formula worked fine. I was able to replace nulls with strikethrough in a pivot table. Since combining the report into a compound layout, the strikethrough has reverted back to nulls. Even when just viewing the pivot table, the same applies.
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I hav also checked that no data exists in the fact table under the null categories and they are true.
Can anyone help with this problem, I have also removed the condition and re-applied but still face the same problem.
Thanks

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hi,
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*Thanks as***, that solves the problem.*
After 10 days Toshiba Support in Germany came back with the same answer.
Basically it seems the UEFI Firmware has some reference to Win 8 or the original OS and key and boat loader that is checks, and you cannot load anything else until you disable it by:
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Hello Mr. Werner
Thank you for your reply.
Can I ask you which Version of InDesign do you use?
I use CS 5.5 and there I can't find the change field "other" you told me.
Can you see it on the screenshot? (Sorry it is german...)
Thank you very much for your support.
Kind regards Alex

How to use case and decode to extract the data

Hello PL/SQL Gurus,
I am using Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production version
I have a table in following format -
drop table TT2;
create table TT2(College, Class,gender,status,fees) as select
'IITB','MBA','M','P',255600 from dual union all select
'IITK','MTech','M','P',300000 from dual union all select
'IITD','MBA','F','P',450000 from dual union all select
'IITKH','MBA','F','P',350000 from dual union all select
'IITC','MTech','F','P',420000 from dual union all select
'IITB','MTech','M','P',185000 from dual union all select
'IITC','MTech','M','P',235000 from dual union all select
'IITD','MBA','F','F',175000 from dual union all select
'IITM','MBA','M','F',257000 from dual union all select
'IITKH','MTech','F','P',335000 from dual union all select
'IITD','MBA','F','P',540335 from dual union all select
'IITC','MBA','F','F',125089 from dual union all select
'IITD','MTech','M','P',290756 from dual union all select
'IITM','MBA','M','P',200000 from dual union all select
'IITKH','MBA','F','F',534990 from dual union all select
'IITD','MBA','F','P',221000 from dual ;some of the extraction conditions are as following -
CASE CONDITION
College in 'IITB' and status='P'- 'WestRegion Passed'
College in 'IITC' and status='P'- 'SouthRegion Passed'
College in 'IITD' and 'IITK' and status='P' and Gender='F' - 'NothRegion Female Passed'
College not in 'IITK' and status='F' - 'Ex Kanpur Failed'
Expected output -
Region Statnding     Fees
WestRegion Passed     440460
SouthRegion Passed     655000
NothRegion Female Passed     1386335
Ex Kanpur Failed     1092079SQL Used
I am using the following query which only make sure of case but this is not how i want the output , if i try to use the case within decode then how to work on this -
SELECT (CASE WHEN College in ('IITB') and status='P' then sum(fees) else 0 end) WP,
(case when College in ('IITC') and status='P' then sum(fees) else 0 end) SP,
(case when College in ('IITD','IITK') and gender='F' and status='P' then sum(fees) else 0 end) NFP,
(case when College in ('IITK') and status='F' then sum(fees) else 0 end) ExKF
FROM
TT2
GROUP BY College, Class,gender,status

user555994 wrote:
Thank you so much jeneesh i am really thankful to you ...vov.
one more query in case if any of the selection don't have the output data , then values will be displayed like -One way..
with t as
--"Add all your descriptions
(select 'WestRegion Passed' region_standing from dual union all
select 'SouthRegion Passed' region_standing from dual union all
select 'NothRegion Female Passed' region_standing from dual union all
select 'Ex Kanpur Failed' region_standing from dual)
select region_standing,sum(fees) fees
        from (
        (SELECT CASE WHEN College in ('IITB') and status='P'
                            then 'WestRegion Passed'
                    when College in ('IITC') and status='P'
                            then 'SouthRegion Passed'
                    when College in ('IITD','IITK') and gender='F' and status='P'
                            then 'NothRegion Female Passed'
                    when College in ('IITK') and status='F'
                            then 'Ex Kanpur Failed'
                    else 'Others' end region_standing,
                    sum(fees) fees
        FROM TT2
        GROUP BY CASE WHEN College in ('IITB') and status='P'
                            then 'WestRegion Passed'
                    when College in ('IITC') and status='P'
                            then 'SouthRegion Passed'
                    when College in ('IITD','IITK') and gender='F' and status='P'
                            then 'NothRegion Female Passed'
                    when College in ('IITK') and status='F'
                            then 'Ex Kanpur Failed'
                    else 'Others' end
        union all
        select region_standing,0
        from t
group by   region_standing;
REGION_STANDING              FEES
Others                     2567835
NothRegion Female Passed   1211335
WestRegion Passed           440600
Ex Kanpur Failed                 0
SouthRegion Passed          655000
{code}
Edited by: jeneesh on Nov 5, 2012 5:07 PM

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revDAVE:
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Flyingfish,
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Any mid or full tower case + Sunbeam LAN Party Bag (includes strong straps that go around case to carry any case and keyboard using backpack style straps, shoulder strap, or a handle)
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Replace CASE with DECODE

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