oracle ocp 19c考題，科目082考試題-date/time functions

4.Which two statements are true about date/time functions in a session where NLS_DATE_FORMAT is set to DD-MON-YYYY HH24:MI:SS? (Choose two.)

A. CURRENT_TIMESTAMP returns the same date and time as SYSDATE with additional details of fractional seconds

B. SYSDATE can be queried only from the DUAL table

C. CURRENT_DATE returns the current date and time as per the session time zone

D. SYSDATE can be used in expressions only if the default date format is DD-MON-RR

E. SYSDATE and CURRENT_DATE return the current date and time set for the operating system of the database server

F. CURRENT_TIMESTAMP returns the same date as CURRENT_DATE

Source:cuug