フリー問題

問題文

A session sets its time zone to a value that differs from the time zone of the machine where the database runs. The session then selects two functions that both return a value of the date type. Which statement describes what each one returns?

選択肢

1. Both of the functions follow the time zone that the session set so the two values always agree with each other whatever the machine reports.
2. The current date function follows the clock of the machine that runs the database and the system date function follows the zone that the session set.
3. Both of the functions follow the clock of the machine so the session setting changes the way the values are printed but not the values themselves.
4. The current date function follows the time zone that the session set and the system date function follows the clock of the machine that runs the database.