2372. Calculate the Influence of Each Salesperson ¶ SQL 1 2 3 4 5 6 7 8 9 10SELECT Salesperson.salesperson_id, Salesperson.name, SUM(IFNULL(Sales.price, 0)) AS total FROM Salesperson LEFT JOIN Customer USING (salesperson_id) LEFT JOIN Sales USING (customer_id) GROUP BY 1;