Which view shows all valid values for the NLS_LANGUAGE, NLS_SORT, NLS_TERRITORY, and NLS_CHARACTERSET parameters?
A. V$VALID_NLS_VALUES
B. NLS_VALID_VALUES
C. NLS_VALUE_OPTIONS
D. V$NLS_VALUE_OPTIONS
E. V$NLS_VALID_VALUES
The V$NLS_VALID_VALUES view shows the names fo all language,territory,sort,and charcater-set definitions that are available in the database.
原文：http://www.cnblogs.com/Babylon/p/7833892.html