MySql
SELECT P.product_name, A.n_of_sales AS unit\nFROM\n    (SELECT product_id, sum(UNIT) as n_of_sales\n    FROM Orders\n    WHERE year(order_date) = 2020 AND month
SELECT P.product_name, A.n_of_sales AS unit\nFROM\n    (SELECT product_id, sum(UNIT) as n_of_sales\n    FROM Orders\n    WHERE year(order_date) = 2020 AND month(order_date) = 2\n    GROUP by product_id) A\nINNER JOIN Products p ON a.product_id = p.product_id\nWHERE A.n_of_sales >= 100
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