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Question2/【+α】SQL/MySQL_question2.sql

@@ -111,4 +111,31 @@ INSERT INTO order_items (order_id, item_id, quantity) VALUES (9, 3, 4);
 INSERT INTO order_items (order_id, item_id, quantity) VALUES (9, 5, 2);
 INSERT INTO order_items (order_id, item_id, quantity) VALUES (9, 8, 10);
 INSERT INTO order_items (order_id, item_id, quantity) VALUES (10, 1, 2);
-INSERT INTO order_items (order_id, item_id, quantity) VALUES (10, 10, 2);
+INSERT INTO order_items (order_id, item_id, quantity) VALUES (10, 10, 2);
+
+--Q1--
+SELECT items.item_id AS '商品ID', items.name AS '商品名',items.price AS '価格',item_category.name AS 'カテゴリ名' FROM items
+LEFT OUTER JOIN item_category  ON item_category.category_id = items.category_id;
+
+
+--Q2--
+SELECT orders.order_id AS '注文ID',orders.order_time AS '注文日時', users.name AS 'ユーザ名',items.name AS '商品名',items.price AS '価格', order_items.quantity AS '数量'
+FROM order_items
+INNER JOIN orders ON orders.order_id = order_items.order_id
+INNER JOIN users ON users.user_id = orders.user_id
+INNER JOIN items ON items.item_id = order_items.item_id
+ORDER BY orders.order_time ASC;
+
+
+--Q3--
+SELECT  orders.order_id AS '注文ID',orders.order_time AS '注文日時',users.name AS 'ユーザ名',
+SUM(items.price * order_items.quantity) AS '合計額'
+FROM orders
+INNER JOIN users ON users.user_id = orders.user_id
+INNER JOIN order_items ON order_items.order_id = orders.order_id
+INNER JOIN items ON items.item_id = order_items.item_id
+GROUP BY orders.order_id,orders.order_time,users.name
+ORDER BY orders.order_time ASC;
+
+--Q4--
+SELECT