Question2です

【練習問題】 SQL/Question1/Quetion1.sql

@@ -0,0 +1,146 @@
+mysql> ALTER TABLE book_table MODIFY COLUMN book_id INT COMMENT '書籍ID';
+Query OK, 0 rows affected (0.01 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+mysql>  ALTER TABLE book_table MODIFY COLUMN book_name VARCHAR(50) COMMENT '書籍名';
+Query OK, 0 rows affected (0.01 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+mysql>  ALTER TABLE book_table MODIFY COLUMN author_name VARCHAR(50) COMMENT '著者';
+Query OK, 0 rows affected (0.01 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+mysql> ALTER TABLE book_table MODIFY COLUMN price INT COMMENT '価格';
+Query OK, 0 rows affected (0.04 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+mysql>  ALTER TABLE book_table MODIFY COLUMN sales_flag INT COMMENT '販売有無';
+Query OK, 0 rows affected (0.01 sec)
+Records: 0  Duplicates: 0  Warnings: 0
+
+mysql> INSERT INTO book_table VALUES(10001, TwoPeace, 三田英一郎, 420, 1);
+ERROR 1054 (42S22): Unknown column 'TwoPeace' in 'field list'
+mysql> INSERT INTO book_table VALUES(10001, 'TwoPeace', '三田英一郎', 420, 1);
+Query OK, 1 row affected (0.00 sec)
+
+mysql>  INSERT INTO book_table VALUES(10002, '名探偵金田二', '青山ふみや', 460, 1);
+Query OK, 1 row affected (0.00 sec)
+
+mysql> INSERT INTO book_table VALUES(10003, '坊ちゃま', '冬目漱岩', 460, 1);
+Query OK, 1 row affected (0.00 sec)
+
+mysql> UPDATE book_table SET book_id = 20001 WHERE 10003;
+Query OK, 3 rows affected (0.01 sec)
+Rows matched: 3  Changed: 3  Warnings: 0
+
+mysql> SELECT * FROM book_table;
++---------+--------------+-------------+-------+------------+
+| book_id | book_name    | author_name | price | sales_flag |
++---------+--------------+-------------+-------+------------+
+|   20001 | TwoPeace     | 三田英一郎  |   420 |          1 |
+|   20001 | 名探偵金田二 | 青山ふみや  |   460 |          1 |
+|   20001 | 坊ちゃま     | 冬目漱岩    |   460 |          1 |
++---------+--------------+-------------+-------+------------+
+3 rows in set (0.00 sec)
+
+mysql> UPDATE book_table SET book_id = 10001 WHERE price = 420;
+Query OK, 1 row affected (0.00 sec)
+Rows matched: 1  Changed: 1  Warnings: 0
+
+mysql> UPDATE book_table SET book_id = 10002 WHERE author_name = '青山ふみや';
+Query OK, 1 row affected (0.00 sec)
+Rows matched: 1  Changed: 1  Warnings: 0
+
+mysql> ^C
+mysql> SELECT * FROM book_table;
++---------+--------------+-------------+-------+------------+
+| book_id | book_name    | author_name | price | sales_flag |
++---------+--------------+-------------+-------+------------+
+|   10001 | TwoPeace     | 三田英一郎  |   420 |          1 |
+|   10002 | 名探偵金田二 | 青山ふみや  |   460 |          1 |
+|   20001 | 坊ちゃま     | 冬目漱岩    |   460 |          1 |
++---------+--------------+-------------+-------+------------+
+3 rows in set (0.00 sec)
+
+mysql> INSERT INTO book_table VALUES(30001, '西方見聞録', '不明', 1000, 1);
+Query OK, 1 row affected (0.00 sec)
+
+mysql> INSERT INTO book_table VALUES(40010, '吾輩は犬である', '冬目漱岩', 420, 1);
+Query OK, 1 row affected (0.00 sec)
+
+mysql> SELECT * FROM book_table;
++---------+----------------+-------------+-------+------------+
+| book_id | book_name      | author_name | price | sales_flag |
++---------+----------------+-------------+-------+------------+
+|   10001 | TwoPeace       | 三田英一郎  |   420 |          1 |
+|   10002 | 名探偵金田二   | 青山ふみや  |   460 |          1 |
+|   20001 | 坊ちゃま       | 冬目漱岩    |   460 |          1 |
+|   30001 | 西方見聞録     | 不明        |  1000 |          1 |
+|   40010 | 吾輩は犬である | 冬目漱岩    |   420 |          1 |
++---------+----------------+-------------+-------+------------+
+5 rows in set (0.00 sec)
+
+mysql> SELECT book_name,author_name FROM book_table;
++----------------+-------------+
+| book_name      | author_name |
++----------------+-------------+
+| TwoPeace       | 三田英一郎  |
+| 名探偵金田二   | 青山ふみや  |
+| 坊ちゃま       | 冬目漱岩    |
+| 西方見聞録     | 不明        |
+| 吾輩は犬である | 冬目漱岩    |
++----------------+-------------+
+5 rows in set (0.00 sec)
+
+mysql>  UPDATE book_table SET author_name = 'マール＝コー＝ポロ' WHERE book_id = 30001;
+Query OK, 1 row affected (0.00 sec)
+Rows matched: 1  Changed: 1  Warnings: 0
+
+mysql>  UPDATE book_table SET sales_flag = 0 WHERE book_id = 30001;
+Query OK, 1 row affected (0.01 sec)
+Rows matched: 1  Changed: 1  Warnings: 0
+
+mysql>  SELECT * FROM book_table;
++---------+----------------+--------------------+-------+------------+
+| book_id | book_name      | author_name        | price | sales_flag |
++---------+----------------+--------------------+-------+------------+
+|   10001 | TwoPeace       | 三田英一郎         |   420 |          1 |
+|   10002 | 名探偵金田二   | 青山ふみや         |   460 |          1 |
+|   20001 | 坊ちゃま       | 冬目漱岩           |   460 |          1 |
+|   30001 | 西方見聞録     | マール＝コー＝ポロ |  1000 |          0 |
+|   40010 | 吾輩は犬である | 冬目漱岩           |   420 |          1 |
++---------+----------------+--------------------+-------+------------+
+5 rows in set (0.00 sec)
+
+mysql> SELECT * FROM book_table where sales_flag = 1;
++---------+----------------+-------------+-------+------------+
+| book_id | book_name      | author_name | price | sales_flag |
++---------+----------------+-------------+-------+------------+
+|   10001 | TwoPeace       | 三田英一郎  |   420 |          1 |
+|   10002 | 名探偵金田二   | 青山ふみや  |   460 |          1 |
+|   20001 | 坊ちゃま       | 冬目漱岩    |   460 |          1 |
+|   40010 | 吾輩は犬である | 冬目漱岩    |   420 |          1 |
++---------+----------------+-------------+-------+------------+
+4 rows in set (0.00 sec)
+
+mysql>   SELECT * FROM book_table where author_name ='冬目漱岩'AND price= 420;
++---------+----------------+-------------+-------+------------+
+| book_id | book_name      | author_name | price | sales_flag |
++---------+----------------+-------------+-------+------------+
+|   40010 | 吾輩は犬である | 冬目漱岩    |   420 |          1 |
++---------+----------------+-------------+-------+------------+
+1 row in set (0.00 sec)
+
+mysql> DELETE FROM book_table where book_id = 20001;
+Query OK, 1 row affected (0.00 sec)
+
+mysql> SELECT * FROM book_table;
++---------+----------------+--------------------+-------+------------+
+| book_id | book_name      | author_name        | price | sales_flag |
++---------+----------------+--------------------+-------+------------+
+|   10001 | TwoPeace       | 三田英一郎         |   420 |          1 |
+|   10002 | 名探偵金田二   | 青山ふみや         |   460 |          1 |
+|   30001 | 西方見聞録     | マール＝コー＝ポロ |  1000 |          0 |
+|   40010 | 吾輩は犬である | 冬目漱岩           |   420 |          1 |
++---------+----------------+--------------------+-------+------------+
+4 rows in set (0.00 sec)

【練習問題】 SQL/Question1/book_table_清水.sql

@@ -1,113 +0,0 @@
-Enter password: *********
-Welcome to the MySQL monitor.  Commands end with ; or \g.
-Your MySQL connection id is 20
-Server version: 8.0.32 MySQL Community Server - GPL
-
-Copyright (c) 2000, 2023, Oracle and/or its affiliates.
-
-Oracle is a registered trademark of Oracle Corporation and/or its
-affiliates. Other names may be trademarks of their respective
-owners.
-
-Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
-
-mysql> CREATE TABLE book_table (
-    -> \c
-mysql> ALTER TABLE book_table
-    -> ADD book_id INT,
-    -> ADD bookname VARCHAR(50),
-    -> ADD author_name VARCHAR(50),
-    -> ADD price INT,
-    -> ADD sales,flag INT;
-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 ',flag INT' at line 6
-mysql>  ALTER TABLE book_table
-    ->     -> ADD book_id INT,
-    ->     -> ADD bookname VARCHAR(50),
-    ->     -> ADD author_name VARCHAR(50),
-    ->     -> ADD price INT,
-    ->     -> ADD price INT,\c
-mysql> ALTER TABLE book_table
-    -> ADD book_id INT,
-    -> ADD book_name VARCHAR(50),
-    -> ADD author_name VARCHAR(50),
-    -> ADD price INT,
-    -> ADD sales_flag INT;
-ERROR 1146 (42S02): Table 'book_table.book_table' doesn't exist
-mysql> SHOW TABLE;
-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> SHOW TABLES;
-Empty set (0.00 sec)
-
-mysql> CREATE TABLE book_table (
-    -> book_id INT,
-    -> book_name VARCHAR(50),
-    -> author_name VARCHAR(50),
-    -> price INT,
-    -> sales_flag INT
-    -> );
-Query OK, 0 rows affected (0.02 sec)
-
-mysql> INSERT INTO book_table
-    -> VALUES(10001, 'TwoPeace', '三田英一郎', 420, 1),
-    -> (10002, '名探偵金田二', '青山ふみや', 460, 1),
-    -> (20001, '坊ちゃま', '冬目漱岩', 460, 1),
-    -> (30001, '西方見聞録', '不明', 1000, 1),
-    -> (40010, '吾輩は犬である', '冬目漱岩', 420, 1);
-Query OK, 5 rows affected (0.02 sec)
-Records: 5  Duplicates: 0  Warnings: 0
-
-mysql> SELECT book_name, author_name FROM book_table;
-+----------------+-------------+
-| book_name      | author_name |
-+----------------+-------------+
-| TwoPeace       | 三田英一郎  |
-| 名探偵金田二   | 青山ふみや  |
-| 坊ちゃま       | 冬目漱岩    |
-| 西方見聞録     | 不明        |
-| 吾輩は犬である | 冬目漱岩    |
-+----------------+-------------+
-5 rows in set (0.00 sec)
-
-mysql> UPDATE book_table SET author_name = 'マール＝コーニポロ', salse_flag = 0 WHERE book_id = 30001;
-ERROR 1054 (42S22): Unknown column 'salse_flag' in 'field list'
-mysql> UPDATE book_table SET author_name = 'マール＝コーニポロ', sales_flag = 0 WHERE book_id = 30001;
-Query OK, 1 row affected (0.01 sec)
-Rows matched: 1  Changed: 1  Warnings: 0
-
-mysql> SELECT * FROM book_table WHERE sales_flag = 1;
-+---------+----------------+-------------+-------+------------+
-| book_id | book_name      | author_name | price | sales_flag |
-+---------+----------------+-------------+-------+------------+
-|   10001 | TwoPeace       | 三田英一郎  |   420 |          1 |
-|   10002 | 名探偵金田二   | 青山ふみや  |   460 |          1 |
-|   20001 | 坊ちゃま       | 冬目漱岩    |   460 |          1 |
-|   40010 | 吾輩は犬である | 冬目漱岩    |   420 |          1 |
-+---------+----------------+-------------+-------+------------+
-4 rows in set (0.00 sec)
-
-mysql> SELECT * FROM book_table WHERE author
-    -> _name = '冬目漱岩' AND price = 420;
-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 '_name = '冬目漱岩' AND price = 420' at line 2
-mysql> SELECT * FROM book_table WHERE author_name = '冬目漱岩' AND price = 420;
-+---------+----------------+-------------+-------+------------+
-| book_id | book_name      | author_name | price | sales_flag |
-+---------+----------------+-------------+-------+------------+
-|   40010 | 吾輩は犬である | 冬目漱岩    |   420 |          1 |
-+---------+----------------+-------------+-------+------------+
-1 row in set (0.01 sec)
-
-mysql> DELETE FROM book_table WHERE book_id = 20001;
-Query OK, 1 row affected (0.02 sec)
-
-mysql> SELECT * FROM book_table;
-+---------+----------------+--------------------+-------+------------+
-| book_id | book_name      | author_name        | price | sales_flag |
-+---------+----------------+--------------------+-------+------------+
-|   10001 | TwoPeace       | 三田英一郎         |   420 |          1 |
-|   10002 | 名探偵金田二   | 青山ふみや         |   460 |          1 |
-|   30001 | 西方見聞録     | マール＝コーニポロ |  1000 |          0 |
-|   40010 | 吾輩は犬である | 冬目漱岩           |   420 |          1 |
-+---------+----------------+--------------------+-------+------------+
-4 rows in set (0.00 sec)
-
-mysql>

【練習問題】 SQL/Question2/Question2.sql

@@ -0,0 +1,122 @@
+mysql> CREATE TABLE item_category (category_id INT,category_name VARCHAR(256));
+Query OK, 0 rows affected (0.02 sec)
+
+mysql> INSERT INTO item_category VALUES (1,'家具');
+Query OK, 1 row affected (0.00 sec)
+
+mysql>  INSERT INTO item_category VALUES (2,'飲料');
+Query OK, 1 row affected (0.00 sec)
+
+mysql>  INSERT INTO item_category VALUES (3,'食品');
+Query OK, 1 row affected (0.05 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> CREATE TABLE items(item_id INT, name VARCHAR(256), price INT, category_id INT);
+Query OK, 0 rows affected (0.02 sec)
+
+mysql> INSERT INTO items VALUES (1,'ローマのテーブル', 150000, 1);
+Query OK, 1 row affected (0.01 sec)
+
+mysql> INSERT INTO items VALUES (2,'げーたるーど2000 500ml', 370, 2);
+Query OK, 1 row affected (0.00 sec)
+
+mysql>  INSERT INTO items VALUES (3,'原始肉', 2500, 3);
+Query OK, 1 row affected (0.00 sec)
+
+mysql>  INSERT INTO items VALUES (4,'魅惑の椅子', 100000, 1);
+Query OK, 1 row affected (0.05 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 (0.05 sec)
+
+mysql>  SELECT * FROM item_category LEFT JOIN items USING(category_id);
++-------------+---------------+---------+------------------------+--------+
+| category_id | category_name | item_id | name                   | price  |
++-------------+---------------+---------+------------------------+--------+
+|           1 | 家具          |       4 | 魅惑の椅子             | 100000 |
+|           1 | 家具          |       1 | ローマのテーブル       | 150000 |
+|           2 | 飲料          |       2 | げーたるーど2000 500ml |    370 |
+|           3 | 食品          |       3 | 原始肉                 |   2500 |
++-------------+---------------+---------+------------------------+--------+
+4 rows in set (0.00 sec)
+
+mysql> SELECT * FROM item_category RIGHT JOIN items 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 item_category RIGHT JOIN items USING(category_id) ORDER BY price ASC;
++-------------+---------+------------------------+--------+---------------+
+| 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)
+
+mysql>  SELECT * FROM item_category RIGHT JOIN items USING(category_id) where category_name = '家具';
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子       | 100000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+2 rows in set (0.00 sec)
+
+mysql>  SELECT * FROM item_category RIGHT JOIN items USING(category_id) where price > 1000 AND price < 50000;
++-------------+---------+--------+-------+---------------+
+| category_id | item_id | name   | price | category_name |
++-------------+---------+--------+-------+---------------+
+|           3 |       3 | 原始肉 |  2500 | 食品          |
++-------------+---------+--------+-------+---------------+
+1 row in set (0.00 sec)
+
+mysql>  SELECT COUNT(*) AS data_count FROM items;
++------------+
+| data_count |
++------------+
+|          4 |
++------------+
+1 row in set (0.01 sec)
+
+mysql>  SELECT * FROM item_category RIGHT JOIN items USING(category_id) WHERE price = (SELECT MAX(price) FROM items);
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+1 row in set (0.00 sec)
+
+mysql>  SELECT * FROM item_category RIGHT JOIN items USING(category_id) WHERE name LIKE '%の%';
++-------------+---------+------------------+--------+---------------+
+| category_id | item_id | name             | price  | category_name |
++-------------+---------+------------------+--------+---------------+
+|           1 |       1 | ローマのテーブル | 150000 | 家具          |
+|           1 |       4 | 魅惑の椅子       | 100000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+2 rows in set (0.00 sec)

【練習問題】 SQL/Question2/item_category_清水.sql

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