diff --git a/【練習問題】 SQL/Question2/item_category_清水.sql b/【練習問題】 SQL/Question2/item_category_清水.sql
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+++ b/【練習問題】 SQL/Question2/item_category_清水.sql	
@@ -0,0 +1,173 @@
+mysql> CREATE TABLE item_category( category_id. INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
+ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '. INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL)' at line 1
+mysql> CREATE TABLE item_category ( category_id, INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
+ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ', INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL)' at line 1
+mysql> CREATE TABLE item_category ( category_id INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
+Query OK, 0 rows affected (0.03 sec)
+
+mysql> DESC item_category;
++---------------+--------------+------+-----+---------+----------------+
+| Field         | Type         | Null | Key | Default | Extra          |
++---------------+--------------+------+-----+---------+----------------+
+| category_id   | int          | NO   | PRI | NULL    | auto_increment |
+| category_name | varchar(256) | NO   |     | NULL    |                |
++---------------+--------------+------+-----+---------+----------------+
+2 rows in set (0.02 sec)
+
+mysql> SELECT * FROM item_category;
+Empty set (0.00 sec)
+
+mysql> INSERT INTO item_category ( category_name ) VALUES ('家具'),('飲料'),('食品');
+Query OK, 3 rows affected (0.01 sec)
+Records: 3  Duplicates: 0  Warnings: 0
+
+mysql> SELECT * FROM item_category;
++-------------+---------------+
+| category_id | category_name |
++-------------+---------------+
+|           1 | 家具          |
+|           2 | 飲料          |
+|           3 | 食品          |
++-------------+---------------+
+3 rows in set (0.00 sec)
+
+mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
+    -> price INT NOT NULL, category_id INT, FOREIGN KEY ( categry_id) REFERENCES item_category(category_id));
+ERROR 1072 (42000): Key column 'categry_id' doesn't exist in table
+mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
+    -> price INT NOT NULL, category_id INT, FOREIGN KEY ( categry_id ) REFERENCES item_category( category_id ));
+ERROR 1072 (42000): Key column 'categry_id' doesn't exist in table
+mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
+    -> price INT NOT NULL, category_id INT, FOREIGN KEY ( category_id ) REFERENCES item_category( category_id ));
+Query OK, 0 rows affected (0.06 sec)
+
+mysql> DESC items;
++-------------+--------------+------+-----+---------+----------------+
+| Field       | Type         | Null | Key | Default | Extra          |
++-------------+--------------+------+-----+---------+----------------+
+| item_id     | int          | NO   | PRI | NULL    | auto_increment |
+| name        | varchar(256) | NO   |     | NULL    |                |
+| price       | int          | NO   |     | NULL    |                |
+| category_id | int          | YES  | MUL | NULL    |                |
++-------------+--------------+------+-----+---------+----------------+
+4 rows in set (0.00 sec)
+
+mysql> INSERT INTO items ( name, price, category_id )
+    -> VALUES ('ローマのテーブル', 150000, 1),('げーたるーど2000 500ml', 370, 2),('原始肉', 2500, 3),('魅惑の椅子', 100000, 1);
+Query OK, 4 rows affected (0.01 sec)
+Records: 4  Duplicates: 0  Warnings: 0
+
+mysql> SELECT * FROM items;
++---------+------------------------+--------+-------------+
+| item_id | name                   | price  | category_id |
++---------+------------------------+--------+-------------+
+|       1 | ローマのテーブル       | 150000 |           1 |
+|       2 | げーたるーど2000 500ml |    370 |           2 |
+|       3 | 原始肉                 |   2500 |           3 |
+|       4 | 魅惑の椅子             | 100000 |           1 |
++---------+------------------------+--------+-------------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id;
++-------------+---------+------------------------+--------+---------------+
+| category_id | item_id | name                   | price  | category_name |
++-------------+---------+------------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子             | 100000 | 家具          |
+|           2 |       2 | げーたるーど2000 500ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                 |   2500 | 食品          |
++-------------+---------+------------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> ORDER BY items.price ASC;
++-------------+---------+------------------------+--------+---------------+
+| category_id | item_id | name                   | price  | category_name |
++-------------+---------+------------------------+--------+---------------+
+|           2 |       2 | げーたるーど2000 500ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                 |   2500 | 食品          |
+|           1 |       4 | 魅惑の椅子             | 100000 | 家具          |
+|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
++-------------+---------+------------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id;
++-------------+---------+------------------------+--------+---------------+
+| category_id | item_id | name                   | price  | category_name |
++-------------+---------+------------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子             | 100000 | 家具          |
+|           2 |       2 | げーたるーど2000 500ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                 |   2500 | 食品          |
++-------------+---------+------------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> ORDER BY items.price ASC;
++-------------+---------+------------------------+--------+---------------+
+| category_id | item_id | name                   | price  | category_name |
++-------------+---------+------------------------+--------+---------------+
+|           2 |       2 | げーたるーど2000 500ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                 |   2500 | 食品          |
+|           1 |       4 | 魅惑の椅子             | 100000 | 家具          |
+|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
++-------------+---------+------------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> WHERE item_category.category_name = '家具';
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子       | 100000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+2 rows in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    ->  FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> WHERE items.price BETWEEN 1000 AND 50000;
++-------------+---------+--------+-------+---------------+
+| category_id | item_id | name   | price | category_name |
++-------------+---------+--------+-------+---------------+
+|           3 |       3 | 原始肉 |  2500 | 食品          |
++-------------+---------+--------+-------+---------------+
+1 row in set (0.00 sec)
+
+mysql> SELECT COUNT (*) AS data_count FROM items;
+ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*) AS data_count FROM items' at line 1
+mysql> SELECT COUNT(*) AS data_count FROM items;
++------------+
+| data_count |
++------------+
+|          4 |
++------------+
+1 row in set (0.01 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> WHERE items.price = ( SELECT MAX(price) FROM items );
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+1 row in set (0.00 sec)
+
+mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
+    -> FROM items JOIN item_category ON items.category_id = item_category.category_id
+    -> WHERE items.name LIKE '%の%';
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子       | 100000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+2 rows in set (0.00 sec)
+
+mysql>
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