--問１
CREATE TABLE item_category (
    category_id INT AUTO_INCREMENT PRIMARY KEY,
    category_name VARCHAR(256) NOT NULL
);

INSERT INTO item_category(category_name) VALUES('家具'),('飲料'),('食品');


--問２
CREATE TABLE items(
    item_id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(256) NOT NULL,
    price INT NOT NULL,
    category_id INT,
    FOREIGN KEY(category_id) REFERENCES item_category(category_id)
);

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);

--問３
SELECT 
a.item_id,
a.name,
a.price,
b.category_id,
b.category_name 
FROM items a
INNER JOIN item_category b
ON a.category_id = b.category_id;


--問４
SELECT *
FROM items
ORDER BY price;

--問５
SELECT 
a.item_id,
a.name,
a.price,
b.category_id,
b.category_name 
FROM items a
INNER JOIN item_category b
ON a.category_id = b.category_id AND b.category_name = '家具';

--問６
SELECT 
a.item_id,
a.name,
a.price,
b.category_id,
b.category_name 
FROM items a
INNER JOIN item_category b
ON a.category_id = b.category_id AND a.price <= 50000 AND a.price >= 1000;

--問７
SELECT COUNT(*) AS data_count
FROM items;

--問８
SELECT * FROM items
WHERE price = (SELECT MAX(price) FROM items);

--問９
SELECT 
a.item_id,
a.name,
a.price,
b.category_id,
b.category_name 
FROM items a
INNER JOIN item_category b
ON a.category_id = b.category_id
WHERE a.name LIKE'%の%';