Difference between decode nad replace

can you plz highlight the difference between decode and replace.. am using oracle10g r2 on solaris....
these r the 2 quereies...
select count(DECODE(EMAIL_L,'%@yahoo.com%','%@thoyahoo.com%')) FROM SIEBEL.MAIL
i understand here if EMAIL_L is like @yahoo.com then it returns @thoyahoo.com
select count(REPLACE(EMAIL_L,'%@yahoo.com%','%@thoyahoo.com%')) FROM SIEBEL.MAIL
and here also if EMAIL_L has @yahoo.com then it returns @thoyahoo.com
But when i try and execute each of them i dont get any output in the decode query....
Any explainations???

decode and literals match the exact literals within column not part of string
SQL> select ename,decode(ename,'MI','IM') from emp
2 /
ENAME      DE
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
ENAME      DE
JAMES
FORD
MILLER
14 rows selected.
SQL> select ename,decode(ename,'MILLER','MILLIONAIRE') from emp
2 /
ENAME      DECODE(ENAM
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
ENAME      DECODE(ENAM
JAMES
FORD
MILLER     MILLIONAIRE
14 rows selected.Khurram

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What is the main difference between decode and If else if

John Spencer wrote:
does require a context switchOf course there is a context switch. And, yes, they are somewhat costly. But not that costly to avoid them at all costs :)
Say you have this very piece of code (select decode) in your PL/SQL procedure. Let's say the procedure is run one million times per day.
It doesn't take long to see how much time that would take.
declare
    x number := 1;
    y number;
begin
   for i in 1000000 loop
      select decode(x, 1,1, 2,2, 3) into y from dual;
   end loop;
end;
/On my test server the above code took about 20 seconds. That's on one core. Given that some "nothing special" production environment is 16-32 cores these days, the loop effectively took about a second.
There are 86,400 seconds in 24 hours. Which means that, massive thanks to the context switches, we have wasted a whopping *0.001%* of our CPU time.
William Robertson wrote:
The OP asked about the difference between the two, and the fact that they belong to two separate languages strikes me as one rather large difference.Well, trains and buses are two types of public transport.
If the OP asked you what would be the best to catch to get to the city, bus or train, would you tell him that buses are more frequent, but can get stuck in traffic, whereas trains run on dedicated tracks so they are more reliable, but not as frequent, and are also slightly more expensive.
OR, would you tell him that those are different types of transportation and they can't therefore be compared.

Diff between decode and case

Hi
I need small clarification about difference between decode and case
Thanks who visit my thread

And for those people who can't be ar$ed to follow links...
Decode allows for conditional output where the conditions are straightforward matches between values.
Case allows for regular conditions to be used such as greater than, less than etc.
Some of the things done by case can be achieved through decode as well but in a more convoluted manner than simply using case.
;)

Difference between CASE and DECODE

Hi All,
Could you please explain me the basic differences between the CASE and DECODE, which performs fast...?
DECODE is Oracle one, and the CASE is ANSI standard.
As per my knowledge, CASE is a statement and DECODE is a function which was defined in the Standard package.
If we use DECODE, the package has to load first, so it will take a little longer than the CASE. CASE is a simple statement which is ANSI standard.
We can use the CASE in the where clause and can not use the DECODE in the where clause.
Please clarify me and correct me if anything wrong.
Thanks,

IMO, the main important point is the way CASE and DECODE handles NULL
SQL> select ename,comm,
2         decode(comm,300,'A',null,'B','C') dcd,
3         case comm when 300 then 'A'
4                   when null then 'B'
5                   else 'C'
6         end cs
7 from emp;
ENAME            COMM D C
SMITH                 B C --"DECODE treats NULL=NULL. But for CASE, NULL is not equal to "another" NULL
ALLEN             300 A A
WARD              500 C C
JONES                 B C
MARTIN           1400 C C
BLAKE                 B C
CLARK                 B C
SCOTT                 B C
KING                  B C
TURNER              0 C C
ADAMS                 B C
JAMES                 B C
FORD                  B C
MILLER                B C
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{code}
Edited by: jeneesh on Jun 3, 2013 1:13 PM
Note: in CASE, you should use IS NULL
{code}
case when comm=300 then 'A'
       when comm is null then 'B'
      else 'C'
end
{code}

Pls tell me difference between case and decode

Hi all
pls tell me difference between case and decode
regards

Well not entirely true when you consider working with
sign and decode together. Your example could be
written with decode and sign like this:
decode(sign(sal-1000),1,sal+comm,-1,sal,0)But the case expression reads more easily, I admit.Rob it was just example you considered it special case ,BTW can you do it for me by DECODE function.
SQL> SELECT sal,comm,CASE WHEN sal>1000 AND sal<1300 THEN sal+comm ELSE 0 END
2    FROM emp
3 /
       SAL       COMM CASEWHENSAL>1000ANDSAL<1300THENSAL+COMMELSE0END
      5000                                                          0
      2850                                                          0
      2450                                                          0
      2975                                                          0
      1250       1400                                            2650
      1600        300                                               0
      1500          0                                               0
       950                                                          0
      1250        500                                            1750
      3000                                                          0
       800                                                          0
       SAL       COMM CASEWHENSAL>1000ANDSAL<1300THENSAL+COMMELSE0END
      3000                                                          0
      1100
      1300                                                          0
14 rows selected.Note for OP CASE can be used within PL/SQL witing ORACLE 9i or later release
but DECODE function can only be used within SQL.
Khurram

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Name nvarchar(1111) NOT NULL,
Month char(6) NOT NULL PRIMARY KEY,
CountName int NOT NULL
SELECT Name, convert(datetime, Month + '01')
FROM @TempData
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<RelOp ... PhysicalOp="Compute Scalar">
<OutputList>
<ColumnReference Column="Name" />
<ColumnReference Column="Expr1003" />
</OutputList>
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<DefinedValue>
<ColumnReference Column="Expr1003" />
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What is the difference betwee decode & case function

Hi
What is the difference betwee decode & case function
1.decode can't used in pl/sql 1) case can be user
2.in decode we can't use (>,<,>=) 2) we can use
any other do u have....
thanks in advance....

DECODE works with expressions which are scalar values.
CASE can work with predicates and subqueries in searchable form.
There is one more Important difference between CASE and DECODE
DECODE can be used Only inside SQL statement....
But CASE can be used any where even as a parameter of a function/procedure
Eg:-
SQL> create or replace procedure pro_01(n number) is
2 begin
3 dbms_output.put_line(' The number = '||n);
4 End;
5 /
Procedure created.
SQL> set serverout on
SQL> var a varchar2(5);
SQL> Begin
2 :a := 'ONE';
3 End;
4 /
PL/SQL procedure successfully completed.
SQL> Begin
2 pro_01(Decode(:a,'ONE',1,0));
3 End;
4 /
pro_01(Decode(:a,'ONE',1,0));
ERROR at line 2:
ORA-06550: line 2, column 9:
PLS-00204: function or pseudo-column 'DECODE' may be used inside a SQL
statement only
ORA-06550: line 2, column 2:
PL/SQL: Statement ignored
SQL> Begin
2 pro_01(case :a when 'ONE' then 1 else 0 end);
3 End;
4 /
The number = 1
PL/SQL procedure successfully completed.Message was edited by:
Avi
Message was edited by:
Avi

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Hello ,
I have stucked in program as below scenario:-
I have two tables of huge data of same structure in a same schema.I need to find the difference exact values in tables.
By using MINUS we can find the difference between two table ,i need to find the what exact difference in the there values with colunm and value at that column.
Example TableA
Col1 col2 col3 col4 col5.... col50
10 ABC 2001 EE 444 TT
40 XYZ 3002 RR 445 TT3
80 DEF 6005 YY 446 YY8
TableB
Col1 col2 col3 col4 col5.... col50
10 ABC 2001 EE 444 TT
40 XYZ 3002 RR 445 TT3
81 DEF 6005 Yu 447 YY8
I need to the out put like this :-
The Diffence between two table is
TableA.COL1=80 TableB.Col1=81, Different
TableA.Col4=YY TableB.col4=Yu,Different
TableA.Col5=446TableB.col5=447,Different
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thanx in advance
KK

Thanx friends for all your efforts
I have a sample code for the same,this will compare the two tables for single row in each table .
what r the modification needed for the multiple rows of values in the two tables??
Please suggest!!
CREATE OR REPLACE PROCEDURE test_compare
IS
TYPE t_col
IS
TABLE OF VARCHAR2 (30)
INDEX BY PLS_INTEGER;
l_col t_col;
j NUMBER := 0;
l_sql VARCHAR2 (2000);
col1 VARCHAR2 (30);
col2 VARCHAR2 (30);
val1 NUMBER;
val2 NUMBER;
status VARCHAR2 (30);
CURSOR c1
IS
SELECT column_id, column_name
FROM all_tab_columns
WHERE table_name = 'TEST1';
BEGIN
FOR i IN c1
LOOP
j := j + 1;
l_col (j) := i.column_name;
END LOOP;
FOR k IN 1 .. j
LOOP
l_sql :=
'SELECT '
|| ''''
|| l_col (k)
|| ''''
|| ', '
|| 'TEST2.'
|| l_col (k)
|| ', '
|| ''''
|| l_col (k)
|| ''''
|| ', '
|| 'TEST1.'
|| l_col (k )
|| ', '
|| 'DECODE(TEST2.'
|| l_col (k)
|| ' -TEST1.'
|| l_col (k)
|| ', 0, ''NO CHANGE'', ''CHANGED'') FROM TEST2, TEST1';
EXECUTE IMMEDIATE l_sql INTO col1, val1,col2, val2, status;
IF status = 'CHANGED'
THEN
DBMS_OUTPUT.put_line( 'TEST2.'
|| col1
|| '='
|| val1
|| ', TEST1.'
|| col2
|| '='
|| val2
|| ', '
|| status);
END IF;
END LOOP;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('Error:- ' || SQLERRM);
END;
/

Difference between decode nad replace

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