|Oracle9i SQL Reference
Release 2 (9.2)
Part Number A96540-02
NLS_CHARSET_NAME returns the name of the character set corresponding to ID number
number. The character set name is returned as a
VARCHAR2 value in the database character set.
number is not recognized as a valid character set ID, then this function returns null.
The following example returns the chartacter set corresponding to character set ID number 2:
Oracle9i Database Globalization Support Guide for a list of character set IDs