mysql> use practice
Database changed


(1)
mysql> create table new_department like department;
Query OK, 0 rows affected (0.05 sec)

mysql> insert into new_department select * from department;
Query OK, 3 rows affected (0.04 sec)
Records: 3  Duplicates: 0  Warnings: 0


(2)
mysql> insert into new_department values ('D004','営業部',12);
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 |
+--------+-----------------------+-------+
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 (0.02 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 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=salary*0.7 where gender='女';
Query OK, 3 rows affected (0.02 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 |
| 高橋良子     | 女     | 210000 |
| 鈴木良枝     | 女     | 315000 |
| 佐藤健次     | 男     | 350000 |
+--------------+--------+--------+
7 rows in set (0.00 sec)

mysql>