(1)
mysql> create table new_department like department;
Query OK, 0 rows affected (0.07 sec)

mysql> show tables;
+---------------------+
| Tables_in_practices |
+---------------------+
| department          |
| employee            |
| new_department      |
| new_employee        |
+---------------------+
4 rows in set (0.00 sec)


(2)
mysql> insert into new_department(dep_id,name,floor)
    -> values ('D004','営業部','12');
Query OK, 1 row affected (0.00 sec)

mysql> select * from new_department;
+--------+----------------+-------+
| dep_id | name           | floor |
+--------+----------------+-------+
| D001   | 総務部         |     8 |
| D002   | 人材開発部     |     8 |
| D003   | システム開発部 |    12 |
| D004   | 営業部         |    12 |
+--------+----------------+-------+
4 rows in set (0.00 sec)

(3)mysql> insert into new_department(dep_id,name,floor)
    -> values ('D005','経理部','8');
Query OK, 1 row affected (0.00 sec)

mysql> select * from new_department;
+--------+----------------+-------+
| dep_id | name           | floor |
+--------+----------------+-------+
| D001   | 総務部         |     8 |
| D002   | 人材開発部     |     8 |
| D003   | システム開発部 |    12 |
| D004   | 営業部         |    12 |
| D005   | 経理部         |     8 |
+--------+----------------+-------+
5 rows in set (0.00 sec)

(4)
mysql> update new_employee set name='鈴木太郎' where emp_id='E0001';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0
mysql> select * from new_employee;
+--------+----------+--------+------------+--------+--------+
| emp_id | name     | gender | birthday   | salary | dep_id |
+--------+----------+--------+------------+--------+--------+
| E0001  | 鈴木太郎 | 男     | 1995-01-01 |   NULL | NULL   |
| E0002  | 佐藤次郎 | 男     | 1990-05-03 | 250000 | D001   |
| E0003  | 鈴木花子 | 女     | 1990-02-11 | 250000 | D002   |
| E0004  | 田中三郎 | 男     | 1975-11-03 | 400000 | D003   |
| E0005  | 田中良子 | 女     | 1985-11-23 | 300000 | D003   |
| E0006  | 鈴木良枝 | 女     | 1970-05-03 | 450000 | D003   |
| E0007  | 佐藤健次 | 男     | 1980-05-05 | 350000 | D001   |
+--------+----------+--------+------------+--------+--------+
7 rows in set (0.00 sec)

(5)
mysql> update new_employee set salary=0.7*salary where gender='女';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3  Changed: 3  Warnings: 0

mysql> select name,gender,salary from new_employee;
+----------+--------+--------+
| name     | gender | salary |
+----------+--------+--------+
| 鈴木太郎 | 男     |   NULL |
| 佐藤次郎 | 男     | 250000 |
| 鈴木花子 | 女     | 175000 |
| 田中三郎 | 男     | 400000 |
| 田中良子 | 女     | 210000 |
| 鈴木良枝 | 女     | 315000 |
| 佐藤健次 | 男     | 350000 |
+----------+--------+--------+
7 rows in set (0.00 sec)