Which is better- Decode,if-else or case statement

In view of the perfomance which is best,second best and third best and why?
Thanks and regards

In view of the perfomance which is best,second best
and third best and why?
Thanks and regardsDECODE and CASE : SQL
CASE, IF-THEN-ELSE : PL/SQL
You can't compare all 3. Plus, it depends on the context in which you want to compare them. If there was always one that was better than the others then we wouldn't have the others.
Doh!

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Which is better smart cover or snugg case

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Personal preference. You just voted for the smart cover.
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Which is better partition or index??

Hi,
i have a table with approximately 2 billion records and there are 2.5 mil records inserted every day.
the table has a field called (Originatetime Date) which has an avg of 35-40 row per second.
most of the queries of this table use this field but normally not as an exact value but with a range
ex:
originatetime >= to_date('2010-01-01','yyyy-mm-dd')
and originatetime < to_date('2010-03-01','yyyy-mm-dd')my question is, which is better to use in this case a daily partition on originatetime or an index on originatetime
because the table is very big and i was thinking that a partition range scan would have better performance.
oracle version : 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production

Since Maximum number of partitions allowed per table or index = 1024K - 1 I would say partition
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Count Distinct Wtih CASE Statement - Does not follow aggregation path

All,
I have a fact table, a day aggregate and a month aggregate. I have a time hierarchy and the month aggregate is set to the month level, the day aggregate is set to the day level within the time hierarchy.
When using any measures and a field from my time dimension .. the appropriate aggregate is chosen, ie month & activity count .. month aggregate is used. Day & activity count .. day aggregate is used.
However - when I use the count distinct aggregate rule .. the request always uses the lowest common denominator. The way I have found to get this to work is to use a logical table source override in the aggregation tab. Once I do this .. it does use the aggregates correctly.
A few questions
1. Is this the correct way to use aggregate navigation for the count distinct aggregation rule (using the source override option)? If yes, why is this necessary for count distinct .. what is special about it?
2. The main problem I have now is that I need to create a simple count measure that has a CASE statement in it. The only way I see to do this is to select the Based on Dimensions checkbox which then allows me to add a CASE statement into my count distinct clause. But now the aggregation issue comes back into play and I can't do the logical table source override when the based on dimensions checkbox is checked .. so I am now stuck .. any help is appreciated.
K

Ok - I found a workaround (and maybe the preferred solution for my particular issue), which is - Using a CASE Statement with a COUNT DISTINCT aggregation and still havine AGGREGATE AWARENESS
To get all three of the requirements above to work I had to do the following:
- Create the COUNT DISTINCT as normal (counting on a USERID physically mapped column in my case)
- Now I need to map my fact and aggregates to this column. This is where I got the case statement to work. Instead of trying to put the case statement inside of the Aggregate definition by using the checkbox 'Base on Dimension' (which didnt allow for aggregate awareness for some reason) .. I instead specified the case statement in the Column Mapping section of the Fact and Aggregate tables.
- Once all the LTS's (facts and aggregates) are mapped .. you still have to define the Logical Table Source overrides in the aggregate tab of the count distinct definition. Add in all the fact and aggregates.
Now the measure will use my month aggregate when i specify month, the day aggregate when i specify day, etc..
If you are just trying to use a Count Distinct (no CASE satement needed) with Aggregate Awareness, you just need to use the Logical Table Source override on the aggregate tab.
There is still a funky issue when using the COUNT aggregate type. As long as you dont map multiple logical table sources to the COUNT column it works fine and as expected. But, if you try to add in multiple sources and aggregate awareness it randomly starts SUMMING everything .. very weird. The blog in this thread says to check the 'Based on Dimension' checkbox to fix the problem but that did not work for me. Still not sure what to do on this one .. but its not currently causing me a problem so I will ignore for now ;)
Thanks for all the help
K

Regarding case statement and decode function

Hi Experts,
I have question.....regarding case statement and decode statement....
Can you please explain me that which one will be efficient,to place in insert statement...
insert statement(
(case when ........then
                     case when ....then
                     else
                     end)
else
end)
or
insert statement(
case when.....then
decode(....)
else
end)
Can you people explain me which one is more efficient method?
Thanks in advance.......

The are major differences to talk about in case of CASE vs DECODE, but performance wise both are pretty much the same.
Have a look at Tom's thread
Ask Tom &quot;better performance - case or decode&quot;
I would suggest to use CASE whenever possible. Don't worry about the performance part.

[SOLVED] So, which is better; VDPAU or VAAPI?

Hey all,
I'm trying to get a grasp on what VDPAU and VAAPI actually mean. Before, on my old laptop which had an AMD card I really didn't care much because all I could use was VAAPI anyway. Now that my new laptop (Intel graphics) supports both, I'm wondering which is better? Perhaps "better" is not the right word, but you get what I mean I hope.
I tried reading some on Google, but I'm not getting much wiser. All I know now is that VDPAU is NVIDIA's equivalent to Intel's VAAPI and that if your program/driver supports VAAPI, it supports a subset of VDPAU?
I know that in order to use VDPAU, I have to use libvdpau-va-gl which seems to be some sort of wrapper/hackish solution? In that case, wouldn't it be better to just use VAAPI which is natively supported by Intel's driver?
As you see, I'm not getting much of this and I hope you can enlighten me!
Last edited by Unia (2013-10-30 17:38:42)

donniezazen wrote:VAAPI is the native protocol for Intel graphic cards and VDPAU is for Nvidia.
Incorrect. They are both, as I said, APIs. Any driver can implement either of them. Intel implements VAAPI, but the open source radeon and nouveau drivers implement VDPAU. The proprietary Nvidia driver implements VDPAU too.
But there's nothing (except developer interest) preventing Intel from implementing VDPAU, or radeon/nouveau from implementing VAAPI. It's a developer choice, nothing more.
donniezazen wrote:VAAPI requires libva-intel-driver and libva-vdpau-driver for Intel and Nvidia respectively.
Not quite. libva-intel-driver is indeed for Intel. But libva-vdpau-driver is a wrapper - when VLC used to be VAAPI only, libva-vdpau-driver allowed you to get hardware acceleration in it with the Nvidia proprietary driver. Nowadays VLC supports both VAAPI and VDPAU, so libva-vdpau-driver isn't needed anymore.
donniezazen wrote:VDPAU requires libvdpau-va-gl/libva-intel-driver and nvidia-utils for Intel and Nvidia respectively.
Again, not quite. libvdpau-va-gl is a wrapper, required only if you want to use Intel with applications that support VDPAU only, like flash or mplayer. VLC and mpv support VAAPI, so libvdpau-va-gl isn't needed with them.
donniezazen wrote:I am wondering if I should install all those packages and set VLC to automatic and let it appropriately choose. I have Optimus laptop but 90% time I use Intel card.
All you need for Intel with VLC is libva-intel-driver, nothing else. You can also install libvdpau-va-gl to use Intel with flash.
I'd keep the Nvidia card deactivated for video decoding, no sense using extra power when Intel can do it. The only advantage Nvidia has is advanced deinterlacing.

Should I use a CASE statement to accomplish or something else

So I have the following query right now
select *
    --bulk collect into possession_leaders
    from
           select    distinct
                     opt.team_id,
                     sch.game_code,
                     sch.game_code_1032,
                     sch.home_team_id_1032,
                     sch.home_team_id,
                     sch.home_team_name,
                     sch.home_team_nickname,
                     sch.home_team_abbrev,
                     sch.away_team_id_1032,
                     sch.away_team_id,
                     sch.away_team_name,
                     sch.away_team_nickname,
                     sch.away_team_abbrev,
                     opt.possession,
                     rank () over (order by possession desc) as rankings_order
          from
                   customer_data.cd_soccer_schedule sch,
                   soccer.soccer_optical_team_gm_stats opt
          where    sch.game_code = opt.game_code
          and      sch.season_id = 200921
          and      opt.possession is not null
          order by rankings_order asc
        )It outputs the following (Sorry for it being so cramped together):
**Note: Columns are in the same order as the query, I didn't post the column names b/c everything would look even sloppier then it does
1     5358     870986     2009050606     6     5359     Kansas City     Wizards     KC     5     5358     D.C.     United     DC     69.5%     1
2     5354     870945     2009040501     1     5354     Chicago     Fire     Chi     10     5362     New York     Red Bulls     RB     58.1%     2
3     5721     870983     2009050211     11     5363     San Jose     Earthquakes     SJ     17     5721     Chivas USA          Chv     56%     3
4     5360     870984     2009050207     7     5360     Los Angeles     Galaxy     LA     10     5362     New York     Red Bulls     RB     55.6%     4
5     5361     870961     2009041705     5     5358     D.C.     United     DC     9     5361     New England     Revolution     NE     55.4%     5
6     5362     870988     2009050810     10     5362     New York     Red Bulls     RB     11     5363     San Jose     Earthquakes     SJ     50.1%     6
7     5363     870988     2009050810     10     5362     New York     Red Bulls     RB     11     5363     San Jose     Earthquakes     SJ     49.9%     7
8     5358     870961     2009041705     5     5358     D.C.     United     DC     9     5361     New England     Revolution     NE     44.6%     8
9     5362     870984     2009050207     7     5360     Los Angeles     Galaxy     LA     10     5362     New York     Red Bulls     RB     44.4%     9
10     5363     870983     2009050211     11     5363     San Jose     Earthquakes     SJ     17     5721     Chivas USA          Chv     44%     10
11     5362     870945     2009040501     1     5354     Chicago     Fire     Chi     10     5362     New York     Red Bulls     RB     41.9%     11
12     5359     870986     2009050606     6     5359     Kansas City     Wizards     KC     5     5358     D.C.     United     DC     30.5%     12What i'm trying to do is basically have the output formated so that when the team_id column matches the either the home_team_id or away_team_id colum i want the following columns to be renamed as:
so if team_id = home_team_id for example then I want the following...
sch.home_team_id_1032 as team_code_1032,
sch.home_team_id as team_code,
sch.home_team_name as team_name,
sch.home_team_nickname as team_nickname,
sch.home_team_abbrev as team_abbrev
and then the away team columns would be...
sch.away_team_id_1032 as opp_team_code_1032,
sch.away_team_id as opp_team_code,
sch.away_team_name as opp_team_name,
sch.away_team_nickname as opp_team_nickname,
sch.away_team_abbrev as opp_team_abbrev
and same thing vice versa if the team_id column matches the away_team_id
How is the best way to go about this? W/a case statement? and if so can someone please post the logic/

Hi,
user652714 wrote:
So I have the following query right now
select *
--bulk collect into possession_leaders
from
select    distinct
opt.team_id,
sch.game_code,
sch.game_code_1032,
sch.home_team_id_1032,
sch.home_team_id,
sch.home_team_name,
sch.home_team_nickname,
sch.home_team_abbrev,
sch.away_team_id_1032,
sch.away_team_id,
sch.away_team_name,
sch.away_team_nickname,
sch.away_team_abbrev,
opt.possession,
rank () over (order by possession desc) as rankings_order
from
customer_data.cd_soccer_schedule sch,
soccer.soccer_optical_team_gm_stats opt
where    sch.game_code = opt.game_code
and      sch.season_id = 200921
and      opt.possession is not null
order by rankings_order asc
)It outputs the following (Sorry for it being so cramped together):
**Note: Columns are in the same order as the query, I didn't post the column names b/c everything would look even sloppier then it doesAre you sure?
The 6th column in the query is home_team name; the 6th column of the output has values like 5359 and 5354. Did you perhaps duplicate the rankings_iorder column at the beginning of the results?
Why don't you simplify the problem. Instead of 15 or 16 columns, 10 of which are twins (5 pairs of 2 columns), why don't you post a problem with 6 columns, 4 of which are twins? Pick short columns, such as home_team_abbrev rather than home_team_name.
Adding the other columns later should be easy; merely a matter of coping one of the columns ion the solution.
Whenever you have a problem, post some sample data and the results you want from that data.
In this case, the sample data can be about 6 columns from the result set below. I'll bet you can make a good sample set with fewer than 12 rows, also.
1     5358     870986     2009050606     6     5359     Kansas City     Wizards     KC     5     5358     D.C.     United     DC     69.5%     1
2     5354     870945     2009040501     1     5354     Chicago     Fire     Chi     10     5362     New York     Red Bulls     RB     58.1%     2
3     5721     870983     2009050211     11     5363     San Jose     Earthquakes     SJ     17     5721     Chivas USA          Chv     56%     3
4     5360     870984     2009050207     7     5360     Los Angeles     Galaxy     LA     10     5362     New York     Red Bulls     RB     55.6%     4
5     5361     870961     2009041705     5     5358     D.C.     United     DC     9     5361     New England     Revolution     NE     55.4%     5
6     5362     870988     2009050810     10     5362     New York     Red Bulls     RB     11     5363     San Jose     Earthquakes     SJ     50.1%     6
7     5363     870988     2009050810     10     5362     New York     Red Bulls     RB     11     5363     San Jose     Earthquakes     SJ     49.9%     7
8     5358     870961     2009041705     5     5358     D.C.     United     DC     9     5361     New England     Revolution     NE     44.6%     8
9     5362     870984     2009050207     7     5360     Los Angeles     Galaxy     LA     10     5362     New York     Red Bulls     RB     44.4%     9
10     5363     870983     2009050211     11     5363     San Jose     Earthquakes     SJ     17     5721     Chivas USA          Chv     44%     10
11     5362     870945     2009040501     1     5354     Chicago     Fire     Chi     10     5362     New York     Red Bulls     RB     41.9%     11
12     5359     870986     2009050606     6     5359     Kansas City     Wizards     KC     5     5358     D.C.     United     DC     30.5%     12What i'm trying to do is basically have the output formated so that when the team_id column matches the either the home_team_id or away_team_id colum i want the following columns to be renamed as:
so if team_id = home_team_id for example then I want the following...
sch.home_team_id_1032 as team_code_1032,
sch.home_team_id as team_code,
sch.home_team_name as team_name,
sch.home_team_nickname as team_nickname,
sch.home_team_abbrev as team_abbrev
and then the away team columns would be...
sch.away_team_id_1032 as opp_team_code_1032,
sch.away_team_id as opp_team_code,
sch.away_team_name as opp_team_name,
sch.away_team_nickname as opp_team_nickname,
sch.away_team_abbrev as opp_team_abbrev
and same thing vice versa if the team_id column matches the away_team_idSorry, column names have to stay the same throughout the query. This is a very unusual request, and it's hard for me to imagine what you really want.
You miight be able to do a UNION and add rows that look like column headings.
No kidding, you have to post the results you want.
No matter how clear an idea you have of what those resutls should be, no one else knows, and it's much easier to post the correct results than to accurately describe them.

Decode Statement Inside the Case statement

Can we use Decode Statement inside a CASE Statement as show below --
It is giving an error -- Is the a better way to write with out any error
create or replace
function test (a varchar2) RETURN VARCHAR2
is
m varchar2(20);
begin
m :=
CASE
WHEN a IN (
'1009' -- (soon obsolete)
,'1010'
,'1019'
,'1051'
,'XGP'
,'XSC')
THEN (SELECT DECODE(v_lef_cd,'NAM','71','GLB','99','01') into m FROM DUAL)
-- ) THEN '01' -- UNITED STATES OF AMERICA
WHEN a IN (
'1069' -- South Africa
,'SAO' -- South Africa
,'SA' -- South Africa
) THEN '26' -- South Africa
ELSE NULL
END;
return m;
end;

Hi,
You can only use DECODE in SQL statements.
Your SELECT DECODE (...) INTO statement would work anywhere a PL/SQL statement is allowed; but PL/SQL statements are not allowed within CASE expressions.
Remember, the expression that comes after THEN in a CASE expression must be a single value.
I would write a function like this using IF ... ELSIF statements. It's a little more typing than CASE, but a lot easier to code, test and maintain.
If you want to use CASE, here's one way:
...     m := CASE
          WHEN a IN ('1069', 'SAO', 'SA')
               THEN '26'     -- South Africa
          WHEN a NOT IN ('1009', '1019', '1051', 'XGP', 'XSC')
          OR    a IS NULL
               THEN NULL
          WHEN v_lef_cd = 'NAM'
               THEN '71'
          WHEN v_lef_cd = 'GLB'
               THEN '99'
               ELSE '01'     -- USA
          END;This assumes that you have a variable v_lef_cd defined.
If you want, you can nest CASE expressions, like this:
...     m := CASE
          WHEN a IN ('1069', 'SAO', 'SA')
               THEN '26'     -- South Africa
          WHEN a IN ('1009', '1019', '1051', 'XGP', 'XSC')
               THEN CASE v_lef_cd
                      WHEN 'NAM'
                         THEN '71'
                      WHEN 'GLB'
                         THEN '99'
                         ELSE '01'     -- USA
                     END
          END;Always format your code, so you can see where the CASE expressions and each of the WHEN clauses begin and end.
When posting formatted text on this site, type these 6 characters:
(all small letters, inside curly brackets) before and after sections of formatted text, to preserve spacing.

Droplet or Simple Nucleus component which is better ?

Hi,
1)Droplet or Simple Nucleus Component which is better as per memory utilization (performence wise).
2)extending one Droplet in another droplet is recomended or injecting droplet which is recomended ?
Please clear these issues if any body ASAP.
thanks

Hi,
Droplets are intended to connect front end (jsps) with the business functionality thro nucleus components. They are primarily used for presentation logic which involves business rules.
So, you need to decide to go for a mere nucleus component or droplet based on your requirement.
It is good to have any business logic / common code in a tools class and call that method from the droplet. In this case, you do not need to extend other droplet and can reuse the code from the tools class by injecting the tools component.
Please let me know if this helps. Or else, please specify the requirements more specifically.
Hope this helps.
Keep posting the updates.
Thanks,
Gopinath Ramasamy

In the below queries which gives better performance

Hi All,
In the below two queries which gives better performance.
Requirement is I need to find if all the 3 score columns are null then I need to assign -ve value -9999 else some +ve value 2
1)
select case when count(CUST_score1)+count(CUST_score2)+count(CUST_score3)=0 then -111111'
else 11 end
from
customer
where subscriber_id=1050
and cust_system_code='1882484'
2)
select case whenCUST_score1 is null and CUST_score2 is null and CUST_score3 is null then '-9999'
else '11' end
from
customer
where subscriber_id=1050
and cust_system_code='1882484'
Please help, because we have more data in table customer so I need to confirm which is better.
Regards,
Chanda

user546757 wrote:
Hi All,
In the below two queries which gives better performance.
Requirement is I need to find if all the 3 score columns are null then I need to assign -ve value -9999 else some +ve value 2
1)
select case when count(CUST_score1)+count(CUST_score2)+count(CUST_score3)=0 then -111111'
else 11 end
from
customer
where subscriber_id=1050
and cust_system_code='1882484'
2)
select case whenCUST_score1 is null and CUST_score2 is null and CUST_score3 is null then '-9999'
else '11' end
from
customer
where subscriber_id=1050
and cust_system_code='1882484'
Please help, because we have more data in table customer so I need to confirm which is better.
Regards,
ChandaThe two statements aren't equivalent. If you know that your where condition is restricting to a single row then there is no point in doing a count as that will introduce an additional aggregate function that isn't required for a single row. If you are dealing with multiple rows from the where condition then the second query will return multiple rows whereas the first query returns 1 row, so they don't do the same thing anyway.

SQL Expression in decode function or case statement?

Can I put SQL expressions in decode function or case statement?
For example,
select le.profile, decode( select count(1) from profile_data where NAME= 'XXXX_AFTER' and object_id = le.profile, 0, 'N', 'Y')
from element le;
or
select le.profile, case WHEN ( select count(1) from profile_data where NAME= 'XXXX_AFTER' and object_id = le.profile) = 0 THEN 'N'
ELSE 'Y'
from element le;
None of the above work.
Can anyone tell me how to make it work?
Is there any workaround?
Thanks,
J

You simply needed and END to your CASE statement;
SQL> with profile_data as (
   select 'XXXX_AFTER' name, 1 object_id from dual),
     element as (
   select 1 profile from dual union all
   select 2 from dual)
select le.profile,
   case WHEN ( select count(1) from profile_data where NAME= 'XXXX_AFTER' and object_id = le.profile) = 0
   THEN 'N'
   ELSE 'Y'
   END new_col
from element le
   PROFILE N
         1 Y
         2 N

Which is better to use: BEx query or Web Application as an iView in portal?

Hi gurus!
Are there any experienced opinions, which is better - publish a BEx query in portal or publish a BEx Web Application in portal? Is it easier to alter the layout attributes etc. if I create a BEx Web Application first before publishing?
What is the way of fixing for example filter item height if I publish BEx query in portal - is there a Web Application that it uses anyhow which I can fix? Or can I use in that case iView -properties in portal?
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ok, means i can use jsp:useBean tag for all my
classes that are not actually bean. so it will be
instantiated at run time and provide efficiency .No. Jsp:useBean is used for java bean components.
>
but when should i use import statement in my jsp and
it happen at translation time so will it create any
type of burden for my code if i import multiple
classes.For non-java beans, you need to import the classes, period.
It's not a burden, it's a necessity.

Which is better for bulk message scenario in sap xi RFC or Proxy

which is better for bulk message scenario in ( RFC or Proxy ) ?
Edited by: prabhatxi on Aug 6, 2010 4:44 PM

Proxy will alwaays be better option in this case, as it is adapter less framework, and communication happens directly with XI central integration engine. So it is always fast communication and gives good performance.
But still you should consider other factors, you may consider using RFC as well, as sometime we go for RFC/IDOC as this are the standard interfaces already available rather than creating structure...
May be you can share more info on what type/volume data are you planning to send via XI?
Hope this cleart your doubt..
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Which is Better Mac or Windows?

Which is Better Mac or Windows?
I got told that Windows is better than Mac.
I need to know:
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2. Why lots of people hate Mac and say that Mac's are crap.
3. Is a iMac worth the cost?
4. Is an iMac harder to use than a Windows computer?
Thank You
From Apple is The Best!!!!!!!

The case of Apple v. Windows is a subjective argument. Both systems have their merits, both have some aspects that some users don't like. Much depends on what you actually want to use them for.
Here is some reading material for you!
A Customer Experience Index report from Forrester Research came to the conclusion after studying almost 4,600 computer users' experiences from 2008 and asking them to score the ease of use of their computers, how enjoyable the experience is and whether or not the systems fulfill their owners' needs.
http://www.appleinsider.com/articles/09/04/17/apple_trumps_windows_pc_makers_in_ customer_experience_study.html
PC World (December 2010) has also found Apple products and after-sales service the most reliable:
http://www.pcworld.com/article/211074/the_tech_brands_you_can_trust.html
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Which is better- Decode,if-else or case statement

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