+α 2 (3)

【練習問題】 SQL/Question1/Question1.txt

@@ -0,0 +1,23 @@
+問１
+テーブル作成
+ CREATE TABLE book_table (book_id INT, book_name VARCHAR(50), author_name VARCHAR(50), price INT, sales_flag INT);
+問２
+ INSERT INTO book_table VALUES (10001, 'TwoPeace', '三田英一郎', 420,1);
+INSERT INTO book_table VALUES (10002, '名探偵金田二', '青山ふみや', 460,1);
+INSERT INTO book_table VALUES (20001, '坊ちゃま', '冬目漱岩', 460,1);
+INSERT INTO book_table VALUES (30001, '西方見聞録', '不明', 1000,1);
+INSERT INTO book_table VALUES (40010, '吾輩は犬である', '冬目漱岩', 420,1);
+
+問３
+SELECT book_name , author_name FROM book_table;
+
+問４
+ UPDATE book_table SET sales_flag= 0 WHERE book_id =30001;
+
+問５
+SELECT * FROM book_table WHERE sales_flag LIKE '%1%';
+
+問６
+SELECT * FROM book_table WHERE author_name = '冬目漱岩' AND price = 420;
+問７
+ DELETE FROM book_table WHERE book_id = 20001;

【練習問題】 SQL/Question2/+α.txt

@@ -0,0 +1,68 @@
+問題１
+mysql> SELECT
+    ->     i.item_id,
+    ->     i.name AS item_name,
+    ->     i.price,
+    ->     c.name AS category_name
+    -> FROM items i
+    -> INNER JOIN item_category c ON i.category_id = c.category_id
+    -> ORDER BY i.item_id;
++---------+------------------------+--------+---------------+
+| item_id | item_name              | price  | category_name |
++---------+------------------------+--------+---------------+
+|       1 | ローマのテーブル       | 150000 | 家具          |
+|       2 | げーたるーど2000 500ml |    370 | 飲料          |
+|       3 | 原始肉                 |   2500 | 食品          |
+|       4 | 魅惑の椅子             | 100000 | 家具          |
+|       5 | 十八茶 600ml           |    110 | 家具          |
+|       6 | いい匂いのするドリアン |   5000 | 食品          |
+|       7 | 太平洋の水 550ml       |    300 | 飲料          |
+|       8 | ひたすら膨らむガム     |    200 | 食品          |
+|       9 | 人をだめにするソファー |  10000 | 家具          |
+|      10 | 人を虜にする名酒       |  20000 | 飲料          |
+|      11 | 新鮮キャベツ           |   1000 | 食品          |
++---------+------------------------+--------+---------------+
+11 rows in set (0.00 sec)
+
+問題２
+
+mysql> SELECT
+    ->     o.order_id AS '注文ID',
+    ->     o.order_time AS '注文日時',
+    ->     u.name AS 'ユーザ名',
+    ->     i.name AS '商品名',
+    ->     i.price AS '価格',
+    ->     oi.quantity AS '数量'
+    -> FROM orders o
+    -> INNER JOIN users u ON o.user_id = u.user_id
+    -> INNER JOIN order_items oi ON o.order_id = oi.order_id
+    -> INNER JOIN items i ON oi.item_id = i.item_id
+    -> ORDER BY o.order_id, i.item_id;
++--------+---------------------+----------+------------------------+--------+------+
+| 注文ID | 注文日時            | ユーザ名 | 商品名                 | 価格   | 数量 |
++--------+---------------------+----------+------------------------+--------+------+
+|      1 | 2015-02-22 12:00:00 | 三浦知一 | げーたるーど2000 500ml |    370 |    1 |
+|      1 | 2015-02-22 12:00:00 | 三浦知一 | いい匂いのするドリアン |   5000 |   10 |
+|      1 | 2015-02-22 12:00:00 | 三浦知一 | 太平洋の水 550ml       |    300 |    1 |
+|      1 | 2015-02-22 12:00:00 | 三浦知一 | 新鮮キャベツ           |   1000 |   10 |
+|      2 | 2015-12-01 15:30:00 | 本田啓介 | 魅惑の椅子             | 100000 |    1 |
+|      3 | 2018-03-20 18:45:00 | 柴崎学   | 人をだめにするソファー |  10000 |    1 |
+|      4 | 2018-05-11 11:28:00 | 遠藤保   | 太平洋の水 550ml       |    300 |    1 |
+|      4 | 2018-05-11 11:28:00 | 遠藤保   | ひたすら膨らむガム     |    200 |    1 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | げーたるーど2000 500ml |    370 |    7 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | 原始肉                 |   2500 |    5 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | 十八茶 600ml           |    110 |    1 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | 太平洋の水 550ml       |    300 |    1 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | 人を虜にする名酒       |  20000 |    1 |
+|      5 | 2018-09-30 10:50:00 | 花川真司 | 新鮮キャベツ           |   1000 |    5 |
+|      6 | 2018-09-12 20:13:00 | 三浦知一 | ひたすら膨らむガム     |    200 |   10 |
+|      7 | 2018-09-15 21:34:00 | 本田啓介 | 魅惑の椅子             | 100000 |    2 |
+|      8 | 2019-05-06 16:00:00 | 三浦知一 | ローマのテーブル       | 150000 |    1 |
+|      8 | 2019-05-06 16:00:00 | 三浦知一 | 人をだめにするソファー |  10000 |    1 |
+|      9 | 2019-12-20 10:39:00 | 柴崎学   | 原始肉                 |   2500 |    4 |
+|      9 | 2019-12-20 10:39:00 | 柴崎学   | 十八茶 600ml           |    110 |    2 |
+|      9 | 2019-12-20 10:39:00 | 柴崎学   | ひたすら膨らむガム     |    200 |   10 |
+|     10 | 2020-01-01 14:11:00 | 遠藤保   | ローマのテーブル       | 150000 |    2 |
+|     10 | 2020-01-01 14:11:00 | 遠藤保   | 人を虜にする名酒       |  20000 |    2 |
++--------+---------------------+----------+------------------------+--------+------+
+23 rows in set (0.00 sec)

【練習問題】 SQL/Question2/Question2.txt

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+問題1
+mysql> CREATE TABLE item_category (
+    ->     category_id INT AUTO_INCREMENT PRIMARY KEY,
+    ->     category_name VARCHAR(256) NOT NULL
+    -> );
+Query OK, 0 rows affected (0.03 sec)
+
+mysql> INSERT INTO item_category ('家具');
+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 ''家具')' at line 1
+mysql> ^C
+mysql>
+mysql> INSERT INTO item_category (category_name) VALUES ('家具');
+Query OK, 1 row affected (0.01 sec)
+
+mysql> INSERT INTO item_category (category_name) VALUES ('飲料');
+Query OK, 1 row affected (0.00 sec)
+
+mysql> INSERT INTO item_category (category_name) VALUES ('食品');
+Query OK, 1 row affected (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)
+
+問題２
+CREATE TABLE items ( item_id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(256), price INT, 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);
+INSERT INTO items (name, price, category_id) VALUES ('げーたるど2000 500 ml', 370, 2);
+mysql> INSERT INTO items (name, price, category_id) VALUES ('原始肉', 2500, 3);
+Query OK, 1 row affected (0.00 sec)
+
+mysql> INSERT INTO items (name, price, category_id) VALUES ('魅惑の橋子', 100000, 1);
+Query OK, 1 row affected (0.00 sec)
+問題３
+SELECT * FROM items 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          |
+|           1 |       4 | 魅惑の橋子            | 100000 | 家具          |
+|           2 |       2 | げーたるど2000 500 ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                |   2500 | 食品          |
++-------------+---------+-----------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+問題４
+SELECT * 
+FROM items 
+JOIN item_category USING (category_id)
+ORDER BY price ASC;
++-------------+---------+-----------------------+--------+---------------+
+| category_id | item_id | name                  | price  | category_name |
++-------------+---------+-----------------------+--------+---------------+
+|           2 |       2 | げーたるど2000 500 ml |    370 | 飲料          |
+|           3 |       3 | 原始肉                |   2500 | 食品          |
+|           1 |       4 | 魅惑の橋子            | 100000 | 家具          |
+|           1 |       1 | ローマのテーブル      | 150000 | 家具          |
++-------------+---------+-----------------------+--------+---------------+
+4 rows in set (0.00 sec)
+
+問題５
+ SELECT * FROM items JOIN item_category 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 | 魅惑の橋子       | 100000 | 家具          |
++-------------+---------+------------------+--------+---------------+
+2 rows in set (0.00 sec)
+
+問題　６
+mysql> SELECT * FROM items JOIN item_category USING (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)
+
+問題７
+mysql> SELECT COUNT(*) AS total_items FROM items;
++-------------+
+| total_items |
++-------------+
+|           4 |
++-------------+
+1 row in set (0.00 sec)
+
+問題８
+mysql> SELECT * FROM items WHERE price = (SELECT MAX(price) FROM items);
++---------+------------------+--------+-------------+
+| item_id | name             | price  | category_id |
++---------+------------------+--------+-------------+
+|       1 | ローマのテーブル | 150000 |           1 |
++---------+------------------+--------+-------------+
+1 row in set (0.00 sec)
+
+問題９
+
+
+mysql> SELECT * FROM items WHERE name LIKE '%の%';
++---------+------------------+--------+-------------+
+| item_id | name             | price  | category_id |
++---------+------------------+--------+-------------+
+|       1 | ローマのテーブル | 150000 |           1 |
+|       4 | 魅惑の橋子       | 100000 |           1 |
++---------+------------------+--------+-------------+
+2 rows in set (0.00 sec)
+
+
+
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