SQL 問題集part2完了
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【練習問題】 SQL/Question1/MySQL SQL問題集 part２.txt
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【練習問題】 SQL/Question1/MySQL SQL問題集 part２.txt
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MySQL SQL問題集 part２
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mysql> CREATE TABLE item_category(category_id INT,category_name VARCHAR(256));
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Query OK, 0 rows affected (0.03 sec)
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mysql> SELECT * FROM item_category;
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Empty set (0.00 sec)
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mysql> alter table item_category ADD PRIMARY KEY (category_id);
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Query OK, 0 rows affected (0.04 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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mysql> alter table item_category MODIFY COLUMN category_name VARCHAR(256) NOT NULL;
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Query OK, 0 rows affected (0.06 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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mysql> CREATE TABLE items (item_id INT,name VARCHAR(256), price INT,category_id INT);
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Query OK, 0 rows affected (0.03 sec)
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mysql> alter table items ADD PRIMARY KEY (item_id);
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Query OK, 0 rows affected (0.03 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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mysql> ALTER TABLE items MODIFY COLUMN price INT NOT NULL;
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Query OK, 0 rows affected (0.03 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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mysql> ALTER TABLE items ADD CONSTRAINT fk_category FOREIGN KEY (category_id) REFERENCES item_category(category_id);
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Query OK, 0 rows affected (0.04 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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mysql> INSERT INTO item_category VALUES (1,'家具');
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Query OK, 1 row affected (0.02 sec)
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mysql> INSERT INTO item_category VALUES(2,'飲料');
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Query OK, 1 row affected (0.01 sec)
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mysql> INSERT INTO item_category VALUES(3,'食料');
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Query OK, 1 row affected (0.01 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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mysql> INSERT INTO items VALUES (1,'ローマのテーブル',150000,1);
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Query OK, 1 row affected (0.00 sec)
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mysql> INSERT INTO items VALUES(2,'げーたるーど2000 500ｍｌ',370,2);
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Query OK, 1 row affected (0.00 sec)
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mysql> INSERT INTO items VALIES(3,'原始肉',2500,3);
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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 'VALIES(3,'原始肉',2500,3)' at line 1
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mysql> INSERT INTO items VALUES(3,'原始肉',2500,3);
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Query OK, 1 row affected (0.01 sec)
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mysql> INSERT INTO items VALUES(4,'魅惑の椅子',100000,1);
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Query OK, 1 row affected (0.01 sec)
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mysql> SEKECT * 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 'SEKECT * FROM items' at line 1
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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 (0.01 sec)
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mysql> SELECT items.category_id,items.item_id,items.name,items.price,item_category.category_name FROM item_category INNER JOIN items 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 FROM item_category INNER JOIN items ON items.category_id = item_category.category_id 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 FROM item_category INNER JOIN items ON items.category_id = item_category.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 FROM item_category INNER JOIN items ON items.category_id = item_category.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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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 (0.02 sec)
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mysql> SELECT items.category_id,items.item_id,items.name,items.price,item_category.category_name FROM item_category INNER JOIN items ON items.category_id = item_category.category_id 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 (0.01 sec)
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mysql> SELECT items.category_id,items.item_id,items.name,items.price,item_category.category_name FROM item_category INNER JOIN items ON items.category_id = item_category.category_id WHERE 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 (0.01 sec)
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