nls nchar characterset

1-- NLS_CHARACTERSET for VARCHAR2, NLS_NCHAR_CHARACTERSET for NVARCHAR2
2-- National Character Set
3SELECT * FROM database_properties WHERE PROPERTY_NAME
4    IN ('NLS_CHARACTERSET', 'NLS_NCHAR_CHARACTERSET');
5SELECT * FROM nls_database_parameters WHERE PARAMETER = 'NLS_NCHAR_CHARACTERSET';
6SELECT * FROM v$nls_parameters WHERE PARAMETER = 'NLS_NCHAR_CHARACTERSET';