how to convert UTF8 Codeset to ISO 8859 codeset conversion

Database

how to convert UTF8 Codeset to ISO 8859 codeset conversion

Hi,

want to conver the codset of the col1 to iso 8899 codeset

SEL

CASE

        WHEN DB.COL1 IS NOT NULL THEN  ' ' || DB.COL1

    ELSE ''

    END

FROM TABLEA

how to rewrite this one? help me

Regards,

Rams