MySQL에서 다른 열에 NULL 값을 삽입하면서 날짜와 시간을 자동으로 삽입하는 방법은 무엇입니까?

mysql> Create Table Testing1(Name Varchar(20),
RegStudent TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
Query OK, 0 rows affected (0.15 sec)

mysql> Insert into Testing1(Name) Values(NULL);
Query OK, 1 row affected (0.08 sec)

mysql> Insert into Testing1(Name) Values(NULL);
Query OK, 1 row affected (0.04 sec)

mysql> Select * from Testing1;
+------+---------------------+
| Name | RegStudent |
+------+---------------------+
| NULL | 2017-10-29 04:46:59 |
| NULL | 2017-10-29 04:47:02 |
+------+---------------------+
2 rows in set (0.05 sec)