10/27

2026-10-27 17:27:13 +09:00
parent 1becaf2b81
commit 9552ee4505
13 changed files with 737 additions and 1 deletions
--- a/練習問題/Part2α.sql
+++ b/練習問題/Part2α.sql
@@ -0,0 +1,99 @@
+--1  
+    SELECT items.item_id, items.name, items.price, item_category.name
+    FROM items
+    INNER JOIN item_category
+    ON items.category_id = item_category.category_id
+    ORDER BY items.item_id;
+    
+--2
+    SELECT orders.order_id, orders.order_time, users.name, items.name, items.price, order_items.quantity
+    FROM orders
+    INNER JOIN users
+    ON orders.user_id = users.user_id
+    INNER JOIN order_items
+    ON orders.order_id = order_items.order_id
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    ORDER BY orders.order_time;
+    
+--3
+    SELECT orders.order_id, orders.order_time,  users.name, SUM(items.price * order_items.quantity) AS total_price
+    FROM orders
+    INNER JOIN users
+    ON orders.user_id = users.user_id
+    INNER JOIN order_items
+    ON orders.order_id = order_items.order_id
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    GROUP BY orders.order_id, orders.order_time, users.name
+    ORDER BY orders.order_time;
+    
+--4
+    SELECT DATE_FORMAT(orders.order_time, '%Y/%m') AS order_month, SUM(order_items.quantity) AS order_count
+    FROM orders
+    INNER JOIN order_items
+    ON orders.order_id = order_items.order_id
+    GROUP BY DATE_FORMAT(orders.order_time, '%Y/%m')
+    ORDER BY DATE_FORMAT(orders.order_time, '%Y/%m');
+    
+--5
+    SELECT DATE_FORMAT(orders.order_time, '%Y') AS order_year, SUM(items.price * order_items.quantity) AS sales_amount
+    FROM orders
+    INNER JOIN order_items
+    ON orders.order_id = order_items.order_id
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    GROUP BY DATE_FORMAT(orders.order_time, '%Y')
+    ORDER BY DATE_FORMAT(orders.order_time, '%Y');
+    
+--6
+    SELECT SUM(items.price * order_items.quantity) AS sales_amount
+    FROM order_items
+    INNER JOIN items
+    ON order_items.item_id = items.item_id;
+    
+--7
+    SELECT item_category.name, SUM(items.price * order_items.quantity) AS sales_amount
+    FROM order_items
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    INNER JOIN item_category
+    ON items.category_id = item_category.category_id
+    GROUP BY item_category.name;
+    
+--8
+    SELECT items.name, SUM(items.price * order_items.quantity) AS sales_amount
+    FROM order_items
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    GROUP BY items.name
+    ORDER BY sales_amount DESC;
+    
+--9
+    SELECT item_category.name, SUM(items.price * order_items.quantity)
+        / (SELECT SUM(items.price * order_items.quantity)
+            FROM order_items
+            INNER JOIN items
+            ON order_items.item_id = items.item_id)
+        * 100 AS ratio
+    FROM order_items
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    INNER JOIN item_category
+    ON items.category_id = item_category.category_id
+    GROUP BY item_category.name
+    ORDER BY ratio DESC;
+    
+--10
+    SELECT items.name, SUM(items.price * order_items.quantity)
+        / (SELECT SUM(items.price * order_items.quantity)
+            FROM order_items
+            INNER JOIN items
+            ON order_items.item_id = items.item_id)
+        * 100 AS ratio
+    FROM order_items
+    INNER JOIN items
+    ON order_items.item_id = items.item_id
+    GROUP BY items.name
+    ORDER BY ratio DESC;
+