select

mysql> select * from m_emp;
+---------------------+------------+--------------+
| empno               | empname    | departmentid |
+---------------------+------------+--------------+
|                   5 | 従業員A    | 10101001     |
|                   6 | 従業員B    | 10101001     |
|                   7 | 従業員C    | 10101002     |
|                   8 | 従業員D    | 10101003     |
| 1234567890123456789 | NULL       | NULL         |
| 1234567890123456790 | takahashi  | 101010       |
+---------------------+------------+--------------+
6 rows in set (0.00 sec)