91 lines
3.3 KiB
Plaintext
91 lines
3.3 KiB
Plaintext
--Q1
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SELECT items.item_id AS '商品ID',
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items.name AS '商品名',
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items.price AS '価格',
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item_category.name AS 'カテゴリ名'
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FROM items INNER JOIN item_category ON items.category_id = item_category.category_id
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ORDER BY items.item_id ASC;
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--Q2
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SELECT orders.order_id AS '注文ID',
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orders.order_time AS '注文日時',
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users.name AS 'ユーザ名',
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items.name AS '商品名',
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items.price AS '価格',
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order_items.quantity AS '数量'
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FROM orders
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INNER JOIN order_items ON orders.order_id = order_items.order_id
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INNER JOIN users ON orders.user_id = users.user_id
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INNER JOIN items ON order_items.item_id = items.item_id
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ORDER BY orders.order_id ASC;
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--Q3
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SELECT orders.order_id AS '注文ID',
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orders.order_time AS '注文日時',
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users.name AS 'ユーザ名',
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SUM(items.price*order_items.quantity) AS '合計額'
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FROM orders
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INNER JOIN order_items ON orders.order_id = order_items.order_id
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INNER JOIN users ON orders.user_id = users.user_id
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INNER JOIN items ON order_items.item_id = items.item_id
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GROUP BY orders.order_id
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ORDER BY orders.order_id ASC;
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--Q4
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SELECT SUBSTRING(orders.order_time, 1, 7) AS '注文月',
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SUM(order_items.quantity) AS '注文数'
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FROM orders
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INNER JOIN order_items ON orders.order_id = order_items.order_id
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GROUP BY SUBSTRING(orders.order_time, 1, 7);
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--Q5
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SELECT SUBSTRING(orders.order_time, 1, 4) AS '注文年',
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SUM(order_items.quantity*items.price) AS '売上額'
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FROM orders
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INNER JOIN order_items ON orders.order_id = order_items.order_id
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INNER JOIN items ON order_items.item_id = items.item_id
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GROUP BY SUBSTRING(orders.order_time, 1, 4)
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ORDER BY SUBSTRING(orders.order_time, 1, 4) ASC;
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--Q6
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SELECT SUM(order_items.quantity*items.price) AS '売上額'
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FROM order_items INNER JOIN items ON order_items.item_id = items.item_id;
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--Q7
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SELECT item_category.name AS 'カテゴリ名',
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SUM(order_items.quantity*items.price) AS '売上額'
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FROM order_items
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INNER JOIN items ON items.item_id = order_items.item_id
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INNER JOIN item_category ON item_category.category_id = items.category_id
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GROUP BY item_category.category_id
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ORDER BY 売上額 DESC;
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--Q8
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SELECT items.name AS '商品名',
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SUM(order_items.quantity*items.price) AS '売上額'
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FROM order_items
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INNER JOIN items ON items.item_id = order_items.item_id
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GROUP BY items.name
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ORDER BY 売上額 DESC;
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--Q9
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SELECT item_category.name AS 'カテゴリ名',
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SUM( 100*order_items.quantity*items.price/
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(SELECT SUM(order_items.quantity*items.price)
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FROM order_items INNER JOIN items ON order_items.item_id = items.item_id) ) AS '構成比（％）'
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FROM order_items
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INNER JOIN items ON items.item_id = order_items.item_id
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INNER JOIN item_category ON item_category.category_id = items.category_id
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GROUP BY item_category.category_id
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ORDER BY 構成比（％） DESC;
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--Q10
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SELECT items.name AS '商品名',
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SUM( 100*order_items.quantity*items.price/
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(SELECT SUM(order_items.quantity*items.price)
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FROM order_items INNER JOIN items ON order_items.item_id = items.item_id) ) AS '構成比（％）'
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FROM order_items
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INNER JOIN items ON items.item_id = order_items.item_id
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GROUP BY items.name
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ORDER BY 構成比（％） DESC;
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