Answer / pari

Decode
1.It’s a function
2.can compare only discrete vaules
3.Pl/Sql standards
4.cannot process null

Case
1.It's an Expression
2.can hande range values
3.ANSI Standards
4.Processing time is faster when compared to Decode
5.can process null

Answer / judith

Decode
The default operator for comparison is '=',
for e.g select deptno,decode
(deptno,10,'dept10',20,dept20,default)

so if the deptno=10 then the value is replaced by dept10
and so on,

whereas in Case:

we can use any operator other than '=',
for e.g
select deptno,
case when deptno=10 and sal>1000 then 'dept10'
else
'dept20'

Hope the difference is made clear.

Regards,
Judith

Answer / vasu

Decode: using for reporting purpose. and it is implemented
by if stmt.
Ex: select decode(job,'CLERK','executive',job) from emp;

Case : implemented by if & elsif condition. it is using
pl/sql equality conditionality.
Ex : select case job='CLERK' then 'executive' else 'no' end
a from emp;

it is also used for multipul colms & multi conditions.

in above stmt a is reffered alias name.

Answer / suman vyas

1) Case Can work with logical operator other than '=' . such as < , > , = < , >=
where Decode performs an equality check only.

2) Decode can work as function inside SQL only,
where Case can work in Pl/Sql as a substitute of IF-THEN-ELSE.

3) Decode can not process Null , where Case can process Null.

4) Case expects datatype Consistency, Decode Dose not.

5) Decode is a function, where Case is a statement.

hope this will give u satisfied Answer for Difference Between CASE AND DECODE.

Thanks
Suman Vyas

Answer / satishe

Decode and Case functionwill work in the same way.the only
difference is we can write conditions in side the case
function.
for Ex;
case(if c>d,d...)
decode(job,'clerk'...)

Answer / gurujothi

*CASE can only be used inside the SQL statement where as CASE can be used anywhere even as a parameter of a function or procedure.
*Decode can do equality check only but Case can do more logic comparisons such as <,>etc.,
*The Case will handle NULL differently

Answer / zeya.ocp

CASE Expr make u use IF-THEN-ELSE logic in sql statements without to invoke procedure.It complies with ANSI SQL.
DECODE function decode an expr in a way similar to IF-THEN-ELSE logic that is used in various languages.it facilitate conditional inquiries.

Answer / neeraj

Can anyone explain me Null value handle by Case & Decode with Example.

Can any body Explain me what are the critical problems you have faced in the designer and repoting level in the real time environment?

2 Answers  

every alternative row should be hilighted ? how u can ?

1 Answers  

What is the diff b/w BO webi reports, crystal reports and xcelsius ? Thanks...

7 Answers   TCS,

what is fantrap and chasmtrap ?

5 Answers   Tech Mahindra,

What is maximum number of promts we can give in a BO report?

1 Answers   Patni,

WHAT IS SAP BO AND BO?

1 Answers  

Draw the architecture of traps?

3 Answers   Wipro,

I HAVE MONTHS AS DEC,JEN,MAY,APRIL... WHICH PROMPT IS USED TO GET REPORT IN SEQUENCE?

2 Answers   Patni,

What is the most complex report you have developed. Explain and how did you overcome??? Please give some examples

2 Answers   NTT Data,

how to create dashboard reports

4 Answers   TCS,

How to open a universe with out using the Designer ??

2 Answers   IBM,

what is the difference between bo and cognos?

1 Answers