The following lines contain the word 'select', 'insert', 'update' or 'delete':
SELECT tzname INTO from_tz_name FROM V$TIMEZONE_NAMES WHERE tzabbrev = from_tz AND ROWNUM = 1;
SELECT tzname INTO to_tz_name FROM V$TIMEZONE_NAMES WHERE tzabbrev = to_tz AND ROWNUM = 1;
SELECT tzname INTO from_tz_name FROM V$TIMEZONE_NAMES WHERE tzabbrev = from_tz AND ROWNUM = 1;
SELECT tzname INTO to_tz_name FROM V$TIMEZONE_NAMES WHERE tzabbrev = to_tz AND ROWNUM = 1;