In the query in Oracle 11 g, how can I refer to the results of different column...

I want to be able to view the results of C1 to another expression of the column C2. I get ORA-00904: identifier not valid "C1", which makes sense. I know that I can repeat the WHOLE very long in my C2 DECODER, but I was wondering if I can register the server many additional cycles to assess the CASE once again.

SELECT [long nested CASE statements] as C1, C2 OF table DECODE(C1,1,'YES','NO')

Thank you very much
AK

Hello

Impossible to refer to the alias at the same or another must therefore repeat the instruction BOX or wrap it in a view online and refer to the alias in that. i.e.

SELECT
    c1,
    DECODE(C1,1,'YES','NO') as C2
FROM
    (
        SELECT
            [very long nested CASE statements] as C1
        FROM
            FROM TABLE
    )

HTH

David

Tags: Database

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