Multiple Columns using a single CASE

Hi,
I have a SQL statement:
SELECT
CASE WHEN
c.code=b.code
AND c.from_id=b.to_id
THEN
COLA
ELSE
COLB
END "Exampl1"
CASE WHEN
c.code=b.code
AND c.from_id=b.to_id
THEN
DATEA
ELSE
DATEB
END "Exampl2"
FROM
table_a a,table_b b,
SELECT *
FROM
table_c
WHERE TYPE='REC') c
WHERE
a.code=b.code
I want to use the CASE statement one time not twice to fetch the required for Example1 and Example 2
Can it be possibleb?
Kindly any help will be benefitial to me

>
I want to use the CASE statement one time not twice to fetch the required for Example1 and Example 2
Can it be possibleb?
>
No - A CASE result is a singel statement and in a SELECT must be a single value.
So 'COLA' is ok but 'COLA, DATEA' will not work.
Just use the CASE once for each column like you are doing.

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user13667036 wrote:
Hello,
Using Oracle 11gR2 on windows 7 client. I have a question on calculating sum() on multiple columns on different columns and store the results in a view. Unfortunately I could not post the problem here as it keeps on giving error "Sorry, this content is not allowed", without telling where or what it is! So I had to post it in the stack-overflow forum, here is the link: http://stackoverflow.com/questions/16529721/how-to-calculate-the-individual-sums-of-multiple-columns-in-a-single-query-ora
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ThanksLooks like you want a simple group by.
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from test
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ERROR at line 1:
ORA-02290: check constraint (TUBBY.FIRS_OF_MONTH) violated
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ME_XE?select
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3     , to_char(year_month, 'fmMonth')   as month
4     , Region
5     , CITY
6     , Handled_Package
7     , Expected_Missing_Package
8     , Actual_Missing_Package
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2012         November             Western                        San Fransisco                       200                       10                      5
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Elapsed: 00:00:00.01
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Can you give an example of a nested decode statement.
test@ora>
test@ora>
test@ora> --
test@ora> drop table t;
Table dropped.
test@ora> create table t as
2 select rownum x, cast(null as varchar2(10)) y from all_objects
3 where rownum <= 10;
Table created.
test@ora>
test@ora> select x, y from t;
         X Y
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
10 rows selected.
test@ora>
test@ora> -- You want to change the values of y to 'a' through 'j' for x = 1 through 10
test@ora> -- and y = 'X' otherwise
test@ora> --
test@ora> -- Let's say the limit on the number of components were 12
test@ora> -- Then your decode statement would've been:
test@ora> --
test@ora> update t
2 set y = decode(x,
3                 1, 'a',
4                 2, 'b',
5                 3, 'c',
6                 4, 'd',
7                 5, 'e',
8                    'f');
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test@ora>
test@ora>
test@ora> select x, y from t;
         X Y
         1 a
         2 b
         3 c
         4 d
         5 e
         6 f
         7 f
         8 f
         9 f
        10 f
10 rows selected.
test@ora>
test@ora> -- As you can see you are unable to:
test@ora> --
test@ora> -- change y to 'g' if x = 7
test@ora> -- change y to 'h' if x = 8
test@ora> -- change y to 'i' if x = 9
test@ora> -- change y to 'j' if x = 10
test@ora> -- change y to 'X' otherwise
test@ora> --
test@ora>
test@ora> -- What you would do then is -
test@ora> -- (i) Let the 11 components remain as they are and
test@ora> -- (ii) Introduce a nested decode function *AS THE 12TH COMPONENT*
test@ora> --
test@ora>
test@ora> rollback;
Rollback complete.
test@ora>
test@ora> --
test@ora> update t
2 set y = decode(x,
3                 1, 'a',
4                 2, 'b',
5                 3, 'c',
6                 4, 'd',
7                 5, 'e',
8                 decode(x,
9                        6, 'f',
10                        7, 'g',
11                        8, 'h',
12                        9, 'i',
13                        10, 'j',
14                            'X')
15                );
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test@ora>
test@ora> select x, y from t;
         X Y
         1 a
         2 b
         3 c
         4 d
         5 e
         6 f
         7 g
         8 h
         9 i
        10 j
10 rows selected.
test@ora>
test@ora>HTH
isotope
Extrapolate that to 255 components and you get 254 + 255 = 509 components. And so on...
Message was edited by:
isotope

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Edited by: A on Apr 21, 2012 11:33 PM
Edited by: A on Apr 21, 2012 11:34 PM
Edited by: A on Apr 21, 2012 11:34 PM

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