①
mysql> create table new_department like department;
Query OK, 0 rows affected (0.03 sec)

mysql> insert into new_department
    -> select * from department;
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> show tables;
+--------------------+
| Tables_in_practice |
+--------------------+
| department         |
| employee           |
| new_department     |
+--------------------+
3 rows in set (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 |
+--------+-----------------------+-------+
3 rows in set (0.00 sec)




---------------------------------------------
②
mysql> insert into new_department values ('D004','営業部',12);
Query OK, 1 row affected (0.01 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 values ('D005','経理部',8);
Query OK, 1 row affected (0.02 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 (0.02 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select * from new_employee;
+--------+--------------+--------+------------+--------+--------+
| emp_id | name         | gender | birthday   | salary | dep_id |
+--------+--------------+--------+------------+--------+--------+
| E00001 | 山田太郎     | 男     | 1995-01-01 |   NULL | NULL   |
| E00002 | 佐藤次郎     | 男     | 1990-05-03 | 250000 | D001   |
| E00003 | 鈴木花子     | 女     | 1990-02-11 | 250000 | D002   |
| E00004 | 田中三郎     | 男     | 1975-11-03 | 400000 | D003   |
| E00005 | 髙橋良子     | 女     | 1985-11-23 | 300000 | D003   |
| E00006 | 鈴木良枝     | 女     | 1970-05-03 | 450000 | D003   |
| E00007 | 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 (0.01 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 |
| 佐藤次郎     | 男     | 250000 |
| 鈴木花子     | 女     | 175000 |
| 田中三郎     | 男     | 400000 |
| 髙橋良子     | 女     | 210000 |
| 鈴木良枝     | 女     | 315000 |
| 佐藤健次     | 男     | 350000 |
+--------------+--------+--------+
7 rows in set (0.00 sec)