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/* Sales */ CREATE TABLE sales ( id int auto_increment primary key, time_stamp DATE, product VARCHAR(255), sales_quantity INT ); INSERT INTO sales (time_stamp, product, sales_quantity) VALUES ("2020-01-14", "Product_A", "100"), ("2020-01-14", "Product_B", "300"), ("2020-01-15", "Product_B", "100"), ("2020-01-15", "Product_C", "350"), ("2020-01-16", "Product_B", "130"), ("2020-01-16", "Product_C", "350"), ("2020-01-16", "Product_D", "670"), ("2020-01-17", "Product_C", "130"), ("2020-01-17", "Product_D", "980"), ("2020-01-17", "Product_E", "700"), ("2020-01-17", "Product_F", "450"); /* Products */ CREATE TABLE products ( id int auto_increment primary key, product VARCHAR(255) ); INSERT INTO products (product) VALUES ("Product_B"), ("Product_D");
WITH cte AS (SELECT product FROM products GROUP BY 1) SELECT MAX(t1.time_stamp_02), (SUM(t1.sales_quantity_02) - SUM(t1.sales_quantity_01)) AS difference FROM (SELECT time_stamp AS time_stamp_01, 0 AS time_stamp_02, SUM(sales_quantity) AS sales_quantity_01, 0 AS sales_quantity_02 FROM sales WHERE time_stamp BETWEEN '2020-01-14' AND '2020-01-14' AND product IN (SELECT product FROM cte) UNION ALL SELECT 0 AS time_stamp_01, time_stamp AS time_stamp_02, 0 AS sales_quantity_01, SUM(sales_quantity) AS sales_quantity_02 FROM sales WHERE time_stamp BETWEEN '2020-01-15' AND '2020-01-15' AND product IN (SELECT product FROM cte)) t1
MAX(t1.time_stamp_02)
difference
2020-01-15
-200