(1)
mysql> create table new_department like department;
Query OK, 0 rows affected (0.10 sec)

mysql> insert into new_department select * from department;
Query OK, 3 rows affected (0.03 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> show tables;
+--------------------+
| Tables_in_practice |
+--------------------+
| department         |
| employee           |
| new_department     |
| tokai              |
+--------------------+
4 rows in set (0.03 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 |
+--------+----------------+-------+
3 rows in set (0.01 sec)

(2)
mysql> insert into new_department 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='山田太郎' where emp_id='E00001';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from new_employee where emp_id='E00001';
+--------+----------+--------+------------+--------+--------+
| emp_id | name     | gender | birthday   | salary | dep_id |
+--------+----------+--------+------------+--------+--------+
| E00001 | 山田太郎 | 男     | 1995-01-01 |   NULL | NULL   |
+--------+----------+--------+------------+--------+--------+
1 row in set (0.01 sec)

(5)
mysql> update new_employee set salary=0.7*salary
    -> where gender='女';
Query OK, 3 rows affected (0.01 sec)
Rows matched: 3  Changed: 3  Warnings: 0


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