单项选择题
A. TIMESTAMP
B. DATE
C. TIMESTAMP WITH TIME ZONE
D. TIMESTAMP WITH LOCAL TIME ZONE
E. DATETIME
单项选择题 Which view shows all valid values for the NLS_LANGUAGE, NLS_SORT, NLS_TERRITORY,and NLS_CHARACTERSET parameters?（）
多项选择题 The NLS_SORT parameter sets the default sort method for which of the following operations?（）
多项选择题 Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）