SLQ_Q2
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m-shimizu
173
【練習問題】 SQL/Question2/item_category_清水.sql
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173
【練習問題】 SQL/Question2/item_category_清水.sql
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mysql> CREATE TABLE item_category( category_id. INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
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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
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mysql> CREATE TABLE item_category ( category_id, INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
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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
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mysql> CREATE TABLE item_category ( category_id INT PRIMARY KEY AUTO_INCREMENT, category_name VARCHAR(256) NOT NULL);
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Query OK, 0 rows affected (0.03 sec)
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mysql> DESC item_category;
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+---------------+--------------+------+-----+---------+----------------+
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| Field | Type | Null | Key | Default | Extra |
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+---------------+--------------+------+-----+---------+----------------+
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| category_id | int | NO | PRI | NULL | auto_increment |
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| category_name | varchar(256) | NO | | NULL | |
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+---------------+--------------+------+-----+---------+----------------+
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2 rows in set (0.02 sec)
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mysql> SELECT * FROM item_category;
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Empty set (0.00 sec)
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mysql> INSERT INTO item_category ( category_name ) VALUES ('家具'),('飲料'),('食品');
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Query OK, 3 rows affected (0.01 sec)
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Records: 3 Duplicates: 0 Warnings: 0
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mysql> SELECT * FROM item_category;
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+-------------+---------------+
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| category_id | category_name |
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+-------------+---------------+
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| 1 | 家具 |
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| 2 | 飲料 |
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| 3 | 食品 |
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+-------------+---------------+
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3 rows in set (0.00 sec)
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mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
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-> price INT NOT NULL, category_id INT, FOREIGN KEY ( categry_id) REFERENCES item_category(category_id));
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ERROR 1072 (42000): Key column 'categry_id' doesn't exist in table
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mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
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-> price INT NOT NULL, category_id INT, FOREIGN KEY ( categry_id ) REFERENCES item_category( category_id ));
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ERROR 1072 (42000): Key column 'categry_id' doesn't exist in table
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mysql> CREATE TABLE items ( item_id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(256) NOT NULL,
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-> price INT NOT NULL, category_id INT, FOREIGN KEY ( category_id ) REFERENCES item_category( category_id ));
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Query OK, 0 rows affected (0.06 sec)
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mysql> DESC items;
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+-------------+--------------+------+-----+---------+----------------+
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| Field | Type | Null | Key | Default | Extra |
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+-------------+--------------+------+-----+---------+----------------+
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| item_id | int | NO | PRI | NULL | auto_increment |
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| name | varchar(256) | NO | | NULL | |
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| price | int | NO | | NULL | |
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| category_id | int | YES | MUL | NULL | |
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+-------------+--------------+------+-----+---------+----------------+
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4 rows in set (0.00 sec)
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mysql> INSERT INTO items ( name, price, category_id )
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-> 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);
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Query OK, 4 rows affected (0.01 sec)
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Records: 4 Duplicates: 0 Warnings: 0
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mysql> SELECT * FROM items;
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+---------+------------------------+--------+-------------+
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| item_id | name | price | category_id |
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+---------+------------------------+--------+-------------+
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| 1 | ローマのテーブル | 150000 | 1 |
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| 2 | げーたるーど2000 500ml | 370 | 2 |
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| 3 | 原始肉 | 2500 | 3 |
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| 4 | 魅惑の椅子 | 100000 | 1 |
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+---------+------------------------+--------+-------------+
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4 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id;
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+-------------+---------+------------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------------+--------+---------------+
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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| 2 | 2 | げーたるーど2000 500ml | 370 | 飲料 |
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> ORDER BY items.price ASC;
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+-------------+---------+------------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------------+--------+---------------+
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| 2 | 2 | げーたるーど2000 500ml | 370 | 飲料 |
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id;
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+-------------+---------+------------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------------+--------+---------------+
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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| 2 | 2 | げーたるーど2000 500ml | 370 | 飲料 |
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> ORDER BY items.price ASC;
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+-------------+---------+------------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------------+--------+---------------+
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| 2 | 2 | げーたるーど2000 500ml | 370 | 飲料 |
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> WHERE item_category.category_name = '家具';
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+-------------+---------+------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------+--------+---------------+
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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+-------------+---------+------------------+--------+---------------+
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2 rows in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> WHERE items.price BETWEEN 1000 AND 50000;
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+-------------+---------+--------+-------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+--------+-------+---------------+
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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+-------------+---------+--------+-------+---------------+
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1 row in set (0.00 sec)
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mysql> SELECT COUNT (*) AS data_count FROM items;
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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
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mysql> SELECT COUNT(*) AS data_count FROM items;
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+------------+
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| data_count |
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+------------+
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| 4 |
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+------------+
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1 row in set (0.01 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> WHERE items.price = ( SELECT MAX(price) FROM items );
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+-------------+---------+------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------+--------+---------------+
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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+-------------+---------+------------------+--------+---------------+
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1 row in set (0.00 sec)
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mysql> SELECT items.category_id, items.item_id, items.name, items.price, item_category.category_name
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-> FROM items JOIN item_category ON items.category_id = item_category.category_id
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-> WHERE items.name LIKE '%の%';
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+-------------+---------+------------------+--------+---------------+
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| category_id | item_id | name | price | category_name |
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+-------------+---------+------------------+--------+---------------+
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| 1 | 1 | ローマのテーブル | 150000 | 家具 |
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| 1 | 4 | 魅惑の椅子 | 100000 | 家具 |
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+-------------+---------+------------------+--------+---------------+
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2 rows in set (0.00 sec)
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mysql>
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