pavel
112 lines
1.9 KiB
SQL
112 lines
1.9 KiB
SQL
/* Задание 1 */
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SELECT
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category,
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count(*) AS products_count
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FROM
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products p
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GROUP BY category
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ORDER BY products_count DESC;
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/* Задание 2
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* Тут всё решение в задании
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* */
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SELECT
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order_id,
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sum(quantity) AS total_quantity,
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sum(quantity * price_at_purchase) AS order_revenue
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FROM
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order_items oi
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GROUP BY order_id
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ORDER BY order_revenue DESC;
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/* Задание 3 */
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SELECT
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p.category,
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COALESCE(sum(oi.quantity * oi.price_at_purchase), 0) AS category_revenue
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FROM
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products p
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LEFT JOIN
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order_items oi ON p.id = oi.product_id
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GROUP BY p.category
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/* Задание 4 */
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SELECT
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o.id AS order_id,
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sum(oi.quantity * oi.price_at_purchase) AS order_revenue
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FROM
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orders o
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LEFT JOIN
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order_items oi ON o.id = oi.order_id
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WHERE o.status = 'paid'
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GROUP BY 1
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ORDER BY 2 DESC
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/* Задание 5 */
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SELECT
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p.category,
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COALESCE(sum(oi.quantity * oi.price_at_purchase), 0) AS category_revenue
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FROM
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products p
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LEFT JOIN
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order_items oi ON p.id = oi.product_id
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GROUP BY
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p.category
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HAVING
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sum(oi.quantity * oi.price_at_purchase) > 1;
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/* Задание 6 */
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SELECT
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country,
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count(is_active) AS active_users_count
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FROM
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users u
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WHERE
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is_active = TRUE
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GROUP BY
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country
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HAVING
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count(is_active) > 2;
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/* Задание 7 */
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SELECT
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p.name AS product_name,
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COALESCE (sum(oi.quantity), 0) AS total_quantity_sold
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FROM
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products p
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LEFT JOIN
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order_items oi ON p.id = oi.product_id
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GROUP BY p.name
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ORDER BY 2 DESC
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LIMIT 3
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/* Задание 8
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* Условие для HAVING в задаче кривое, < 100 ничего нет
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* */
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SELECT
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order_id,
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SUM(quantity * price_at_purchase) AS order_revenue
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FROM
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order_items oi
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GROUP BY
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order_id
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HAVING
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SUM(quantity * price_at_purchase) < 10000
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ORDER BY 2;
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