# Select data
SET @@time_zone = 'SYSTEM';
SELECT "SET @@time_zone = 'SYSTEM' before select", datetime_value, timestamp_value, inputted_timezone FROM datetime_timestamp ORDER BY id;

SET @@time_zone = '+07:00';
SELECT "SET @@time_zone = '+07:00' before select", datetime_value, timestamp_value, inputted_timezone FROM datetime_timestamp ORDER BY id;