last_insert_id

mysql> insert into m_emp (empno,empname,departmentid) values (3,'takahashi','101010');　←　empnoを3で指定する
Query OK, 1 row affected (0.29 sec)

mysql> select * from m_emp;
+---------------------+------------+--------------+
| empno               | empname    | departmentid |
+---------------------+------------+--------------+
|                   3 | takahashi  | 101010       |　←　レコードが追加されている
|                   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       |
+---------------------+------------+--------------+
7 rows in set (0.00 sec)

mysql>  select last_insert_id();
+---------------------+
| last_insert_id()    |
+---------------------+
| 1234567890123456790 |　←　変わっていない
+---------------------+
1 row in set (0.00 sec)