MySQL SQL問題集 part２ 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> alter table item_category ADD PRIMARY KEY (category_id); Query OK, 0 rows affected (0.04 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> alter table item_category MODIFY COLUMN category_name VARCHAR(256) NOT NULL; Query OK, 0 rows affected (0.06 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> CREATE TABLE items (item_id INT,name VARCHAR(256), price INT,category_id INT); Query OK, 0 rows affected (0.03 sec) mysql> alter table items ADD PRIMARY KEY (item_id); Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE items MODIFY COLUMN price INT NOT NULL; Query OK, 0 rows affected (0.03 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE items ADD CONSTRAINT fk_category FOREIGN KEY (category_id) REFERENCES item_category(category_id); Query OK, 0 rows affected (0.04 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> INSERT INTO item_category VALUES (1,'家具'); Query OK, 1 row affected (0.02 sec) mysql> INSERT INTO item_category VALUES(2,'飲料'); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO item_category VALUES(3,'食料'); Query OK, 1 row affected (0.01 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> INSERT INTO items VALUES (1,'ローマのテーブル',150000,1); Query OK, 1 row affected (0.00 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 VALIES(3,'原始肉',2500,3); 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 mysql> INSERT INTO items VALUES(3,'原始肉',2500,3); Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO items VALUES(4,'魅惑の椅子',100000,1); Query OK, 1 row affected (0.01 sec) mysql> SEKECT * 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 'SEKECT * FROM items' at line 1 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 (0.01 sec) 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; +-------------+---------+--------------------------+--------+---------------+ | 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 item_category INNER JOIN items ON items.category_id = item_category.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 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'; +-------------+---------+------------------+--------+---------------+ | 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 item_category INNER JOIN items ON items.category_id = item_category.category_id WHERE 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; +------------+ | data_count | +------------+ | 4 | +------------+ 1 row in set (0.02 sec) 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); +-------------+---------+------------------+--------+---------------+ | 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 (0.01 sec) 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%'; +-------------+---------+------------------+--------+---------------+ | 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 (0.01 sec)