mysql> SHOW databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| q1                 |
| rezodb             |
| sys                |
+--------------------+
6 rows in set (0.01 sec)

mysql> CREATE DATABASE Q2;
Query OK, 1 row affected (0.02 sec)

mysql> SHOW databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| q1                 |
| q2                 |
| rezodb             |
| sys                |
+--------------------+
7 rows in set (0.00 sec)

mysql> USE q2;
Database changed
mysql> SHOW tables;
Empty set (0.00 sec)

mysql> CREATE TABLE item_category(category_id INT, category_name VARCHAR(256));
Query OK, 0 rows affected (0.03 sec)

mysql> SELECT * FROM item_category;
Empty set (0.00 sec)

mysql> CREATE TABLE items(item_id INT, name VARCHAR(256), price INT, category_id INT);
Query OK, 0 rows affected (0.03 sec)

mysql> SELECT * FROM item_category;
Empty set (0.00 sec)

mysql> INSERT INTO item_category VALUES(1, '家具'), (2, '飲料'), (3, '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> SELECT * FROM item;
ERROR 1146 (42S02): Table 'q2.item' doesn't exist
mysql> SELECT * FROM items;
Empty set (0.00 sec)

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);
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
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);
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
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);
Query OK, 4 rows affected (0.00 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 * FROM items, item_category;
+---------+------------------------+--------+-------------+-------------+---------------+
| item_id | name                   | price  | category_id | category_id | category_name |
+---------+------------------------+--------+-------------+-------------+---------------+
|       1 | ローマのテーブル       | 150000 |           1 |           3 | 食品          |
|       1 | ローマのテーブル       | 150000 |           1 |           2 | 飲料          |
|       1 | ローマのテーブル       | 150000 |           1 |           1 | 家具          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           3 | 食品          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           2 | 飲料          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           1 | 家具          |
|       3 | 原始肉                 |   2500 |           3 |           3 | 食品          |
|       3 | 原始肉                 |   2500 |           3 |           2 | 飲料          |
|       3 | 原始肉                 |   2500 |           3 |           1 | 家具          |
|       4 | 魅惑の椅子             | 100000 |           1 |           3 | 食品          |
|       4 | 魅惑の椅子             | 100000 |           1 |           2 | 飲料          |
|       4 | 魅惑の椅子             | 100000 |           1 |           1 | 家具          |
+---------+------------------------+--------+-------------+-------------+---------------+
12 rows in set (0.00 sec)

mysql> SELECT * FROM items JOIN item_category;
+---------+------------------------+--------+-------------+-------------+---------------+
| item_id | name                   | price  | category_id | category_id | category_name |
+---------+------------------------+--------+-------------+-------------+---------------+
|       1 | ローマのテーブル       | 150000 |           1 |           3 | 食品          |
|       1 | ローマのテーブル       | 150000 |           1 |           2 | 飲料          |
|       1 | ローマのテーブル       | 150000 |           1 |           1 | 家具          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           3 | 食品          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           2 | 飲料          |
|       2 | げーたるーど2000 500ml |    370 |           2 |           1 | 家具          |
|       3 | 原始肉                 |   2500 |           3 |           3 | 食品          |
|       3 | 原始肉                 |   2500 |           3 |           2 | 飲料          |
|       3 | 原始肉                 |   2500 |           3 |           1 | 家具          |
|       4 | 魅惑の椅子             | 100000 |           1 |           3 | 食品          |
|       4 | 魅惑の椅子             | 100000 |           1 |           2 | 飲料          |
|       4 | 魅惑の椅子             | 100000 |           1 |           1 | 家具          |
+---------+------------------------+--------+-------------+-------------+---------------+
12 rows in set (0.00 sec)

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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
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 * FROM item_category;
+-------------+---------------+
| category_id | category_name |
+-------------+---------------+
|           1 | 家具          |
|           2 | 飲料          |
|           3 | 食品          |
+-------------+---------------+
3 rows in set (0.00 sec)

mysql> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON category_id = category_id;
ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
mysql> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON category_id = items.category_id;
ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
mysql> SELECT category_id, item_id, name, price FROM items INNER JOIN item_category ON item_category.category_id = items.category_id;
ERROR 1052 (23000): Column 'category_id' in field list is ambiguous
mysql> SELECT * FROM item_category INNTER JOIN items ON item_category.category_id = items.category_item;
ERROR 1054 (42S22): Unknown column 'item_category.category_id' in 'on clause'
mysql> SELECT * FROM item_category INNER JOIN items ON item_category.category_id = items.category_item;
ERROR 1054 (42S22): Unknown column 'items.category_item' in 'on clause'
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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
mysql>
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;
ERROR 1054 (42S22): Unknown column 'item_category.name' in 'field list'
mysql> SHOW COLUMNS FROM
    -> ;
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
mysql> SELECT * FROM items INNER JOIN item_category USING(category_id);
+-------------+---------+------------------------+--------+---------------+
| category_id | item_id | name                   | price  | category_name |
+-------------+---------+------------------------+--------+---------------+
|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
|           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          |
+-------------+---------+------------------------+--------+---------------+
4 rows in set (0.00 sec)

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 * FROM item_category;
+-------------+---------------+
| category_id | category_name |
+-------------+---------------+
|           1 | 家具          |
|           2 | 飲料          |
|           3 | 食品          |
+-------------+---------------+
3 rows in set (0.00 sec)

mysql> SELECT * FROM items INNER JOIN item_category USING(category_id);
+-------------+---------+------------------------+--------+---------------+
| category_id | item_id | name                   | price  | category_name |
+-------------+---------+------------------------+--------+---------------+
|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
|           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          |
+-------------+---------+------------------------+--------+---------------+
4 rows in set (0.00 sec)

mysql> SELECT * FROM items INNER JOIN item_category USING(category_id) as ktable;
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
mysql> CREATE table SELECT * FROM items INNER JOIN item_category USING(category_id);
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
mysql> SELECT * FROM items INNER JOIN item_category USING(category_id);
+-------------+---------+------------------------+--------+---------------+
| category_id | item_id | name                   | price  | category_name |
+-------------+---------+------------------------+--------+---------------+
|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
|           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          |
+-------------+---------+------------------------+--------+---------------+
4 rows in set (0.00 sec)

mysql> SELECT * FROM category_id ORFER BY price;
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
mysql> SELECT * FROM items INNER JOIN item_category USING(category_id);
+-------------+---------+------------------------+--------+---------------+
| category_id | item_id | name                   | price  | category_name |
+-------------+---------+------------------------+--------+---------------+
|           1 |       1 | ローマのテーブル       | 150000 | 家具          |
|           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          |
+-------------+---------+------------------------+--------+---------------+
4 rows in set (0.00 sec)

mysql> SELECT * FROM ORFER BY price;
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
mysql> SELECT * FROM items INNER JOIN item_category USING(category_id) ORDER BY price;
+-------------+---------+------------------------+--------+---------------+
| 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)