nls_charset_decl_len
nls_charset_id, nls_charset_name
nls_collation_id, nls_collation_name
nls_initcap
nls_lower, nls_upper
nlssort nls_charset_id returns a character set's CSID (which is used, for example, in dbms_lob.loadclobfromfile) select nls_charset_id('we8mswin1252') from dual;
-- 178
select nls_charset_name(178) from dual;
-- WE8MSWIN1252