The CONVERT function converts a character string to the specified
    character set.

    You cannot specify the source character set as you can with
    Oracle. The destination character set must be a character set
    supported by Oracle Rdb.

    The CONVERT function is functionally equivalent to the
    TRANSLATE...USING function.

    Example: Using the CONVERT function

    SQL> SELECT CONVERT (english, RDB$SHIFT_JIS)
    cont> FROM colours;

     Black
     White
     Blue
     Red
     Yellow
     Green
    6 rows selected