133 lines
5.0 KiB
Plaintext
133 lines
5.0 KiB
Plaintext
問題1
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mysql> CREATE TABLE item_category (
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-> category_id INT AUTO_INCREMENT PRIMARY KEY,
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-> category_name VARCHAR(256) NOT NULL
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-> );
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Query OK, 0 rows affected (0.03 sec)
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mysql> INSERT INTO item_category ('家具');
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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 ''家具')' at line 1
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mysql> ^C
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mysql>
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mysql> INSERT INTO item_category (category_name) VALUES ('家具');
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Query OK, 1 row affected (0.01 sec)
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mysql> INSERT INTO item_category (category_name) VALUES ('飲料');
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Query OK, 1 row affected (0.00 sec)
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mysql> INSERT INTO item_category (category_name) VALUES ('食品');
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Query OK, 1 row affected (0.00 sec)
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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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問題２
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CREATE TABLE items ( item_id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(256), price INT, category_id INT, FOREIGN KEY (category_id) REFERENCES item_category(category_id));
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INSERT INTO items (name, price, category_id)
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-> VALUES ('ローマのテーブル', 150000, 1);
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INSERT INTO items (name, price, category_id) VALUES ('げーたるど2000 500 ml', 370, 2);
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mysql> INSERT INTO items (name, price, category_id) VALUES ('原始肉', 2500, 3);
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Query OK, 1 row affected (0.00 sec)
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mysql> INSERT INTO items (name, price, category_id) VALUES ('魅惑の橋子', 100000, 1);
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Query OK, 1 row affected (0.00 sec)
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問題３
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SELECT * FROM items JOIN item_category USING (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 | 魅惑の橋子 | 100000 | 家具 |
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| 2 | 2 | げーたるど2000 500 ml | 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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問題４
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SELECT *
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FROM items
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JOIN item_category USING (category_id)
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ORDER BY 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 | げーたるど2000 500 ml | 370 | 飲料 |
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| 3 | 3 | 原始肉 | 2500 | 食品 |
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| 1 | 4 | 魅惑の橋子 | 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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問題５
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SELECT * FROM items JOIN item_category USING (category_id) WHERE 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 | 魅惑の橋子 | 100000 | 家具 |
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+-------------+---------+------------------+--------+---------------+
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2 rows in set (0.00 sec)
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問題 ６
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mysql> SELECT * FROM items JOIN item_category USING (category_id) WHERE 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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問題７
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mysql> SELECT COUNT(*) AS total_items FROM items;
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+-------------+
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| total_items |
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+-------------+
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| 4 |
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+-------------+
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1 row in set (0.00 sec)
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問題８
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mysql> SELECT * FROM items WHERE price = (SELECT MAX(price) 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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+---------+------------------+--------+-------------+
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1 row in set (0.00 sec)
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問題９
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mysql> SELECT * FROM items WHERE name LIKE '%の%';
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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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| 4 | 魅惑の橋子 | 100000 | 1 |
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+---------+------------------+--------+-------------+
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2 rows in set (0.00 sec)
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