SQL練習問題
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253
DATABASE_Q2_hirayama;.txt
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253
DATABASE_Q2_hirayama;.txt
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mysql> SHOW databases;
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+--------------------+
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| Database |
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+--------------------+
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| information_schema |
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| mysql |
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| performance_schema |
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| q1 |
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| rezodb |
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| sys |
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+--------------------+
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6 rows in set (0.01 sec)
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mysql> CREATE DATABASE Q2;
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Query OK, 1 row affected (0.02 sec)
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mysql> SHOW databases;
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+--------------------+
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| Database |
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+--------------------+
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| information_schema |
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| mysql |
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| performance_schema |
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| q1 |
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| q2 |
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| rezodb |
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| sys |
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+--------------------+
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7 rows in set (0.00 sec)
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mysql> USE q2;
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Database changed
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mysql> SHOW tables;
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Empty set (0.00 sec)
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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> 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> SELECT * FROM item_category;
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Empty set (0.00 sec)
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mysql> INSERT INTO item_category VALUES(1, '家具'), (2, '飲料'), (3, '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> SELECT * FROM item;
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ERROR 1146 (42S02): Table 'q2.item' doesn't exist
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mysql> SELECT * FROM items;
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Empty set (0.00 sec)
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mysql> INSERT INTO items VALUES(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);
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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 '2500, 3), (4, '魅惑の椅子' 100000, 1)' at line 1
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mysql> INSERT INTO items VALUES(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);
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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 '100000, 1)' at line 1
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mysql> INSERT INTO items VALUES(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);
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Query OK, 4 rows affected (0.00 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 * FROM items, item_category;
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+---------+------------------------+--------+-------------+-------------+---------------+
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| item_id | name | price | category_id | category_id | category_name |
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+---------+------------------------+--------+-------------+-------------+---------------+
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| 1 | ローマのテーブル | 150000 | 1 | 3 | 食品 |
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| 1 | ローマのテーブル | 150000 | 1 | 2 | 飲料 |
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| 1 | ローマのテーブル | 150000 | 1 | 1 | 家具 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 3 | 食品 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 2 | 飲料 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 1 | 家具 |
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| 3 | 原始肉 | 2500 | 3 | 3 | 食品 |
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| 3 | 原始肉 | 2500 | 3 | 2 | 飲料 |
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| 3 | 原始肉 | 2500 | 3 | 1 | 家具 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 3 | 食品 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 2 | 飲料 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 1 | 家具 |
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+---------+------------------------+--------+-------------+-------------+---------------+
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12 rows in set (0.00 sec)
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mysql> SELECT * FROM items JOIN item_category;
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+---------+------------------------+--------+-------------+-------------+---------------+
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| item_id | name | price | category_id | category_id | category_name |
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+---------+------------------------+--------+-------------+-------------+---------------+
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| 1 | ローマのテーブル | 150000 | 1 | 3 | 食品 |
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| 1 | ローマのテーブル | 150000 | 1 | 2 | 飲料 |
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| 1 | ローマのテーブル | 150000 | 1 | 1 | 家具 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 3 | 食品 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 2 | 飲料 |
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| 2 | げーたるーど2000 500ml | 370 | 2 | 1 | 家具 |
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| 3 | 原始肉 | 2500 | 3 | 3 | 食品 |
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| 3 | 原始肉 | 2500 | 3 | 2 | 飲料 |
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| 3 | 原始肉 | 2500 | 3 | 1 | 家具 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 3 | 食品 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 2 | 飲料 |
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| 4 | 魅惑の椅子 | 100000 | 1 | 1 | 家具 |
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+---------+------------------------+--------+-------------+-------------+---------------+
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12 rows in set (0.00 sec)
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mysql> SELECT item_category.category_id, items.item_id, items.name, items.price, item_category.name FROM item_category INNER JOIN items ON item_category.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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mysql> SELECT item_category.category_id, items.item_id, items.name, items.price, item_category.name FROM item_category INNER JOIN items ON item_category.category_id = item_category.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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mysql> SELECT item_category.category_id, items.item_id, items.name, items.price, item_category.name FROM item_category INNER JOIN items ON item_category.category_id = items.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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mysql> SELECT item_category.category_id, items.item_id, items.name, items.price, item_category.name FROM item_category INNER JOIN items ON items.category_id = item_category.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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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 * 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> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON category_id = category_id;
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ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
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mysql> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON category_id = items.category_id;
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ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
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mysql> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON item_category.category_id = items.category_id;
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ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
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mysql> SELECT * FROM item_category INNTER JOIN items ON item_category.category_id = items.category_item;
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ERROR 1054 (42S22): Unknown column 'item_category.category_id' in 'on clause'
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mysql> SELECT * FROM item_category INNER JOIN items ON item_category.category_id = items.category_item;
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ERROR 1054 (42S22): Unknown column 'items.category_item' in 'on clause'
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mysql> SELECT item_category.category_id as category_id, items.item_id as item_id, items.name as name, items.price as price, item_category.name as name FROM item_category INNER JOIN items ON item_category.category_id = items.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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mysql>
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mysql> SELECT item_category.category_id as category_id, items.item_id as item_id, items.name, items.price as price, item_category.name as name FROM item_category INNER JOIN items ON item_category.category_id = items.category_id;
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ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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mysql> SHOW COLUMNS FROM
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-> ;
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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 '' at line 1
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mysql> SELECT * FROM items INNER 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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| 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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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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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 * 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> SELECT * FROM items INNER 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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| 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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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT * FROM items INNER JOIN item_category USING(category_id) as ktable;
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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 ktable' at line 1
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mysql> CREATE table SELECT * FROM items INNER JOIN item_category USING(category_id);
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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 'SELECT * FROM items INNER JOIN item_category USING(category_id)' at line 1
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mysql> SELECT * FROM items INNER 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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| 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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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT * FROM category_id ORFER BY price;
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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 'BY price' at line 1
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mysql> SELECT * FROM items INNER 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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| 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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+-------------+---------+------------------------+--------+---------------+
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4 rows in set (0.00 sec)
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mysql> SELECT * FROM ORFER BY price;
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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 'BY price' at line 1
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mysql> SELECT * FROM items INNER JOIN item_category USING(category_id) ORDER BY price;
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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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