How to Check Database Language,Territory and Character Set

select DECODE(parameter, 'NLS_CHARACTERSET', 'CHARACTER_SET','NLS_LANGUAGE', 'LANGUAGE','NLS_TERRITORY', 'TERRITORY') name,value

from v$nls_parameters

WHERE parameter IN ( 'NLS_CHARACTERSET', 'NLS_LANGUAGE', 'NLS_TERRITORY');

NAME VALUE

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LANGUAGE AMERICAN

TERRITORY AMERICA

CHARACTER_SET AL32UTF8