<prompt> Kutokana na meza mbili, moja kwa ajili ya maagizo ya wateja na nguzo OrderID, CustomerID, na OrderDate, na moja kwa ajili ya bidhaa za utaratibu na nguzo OrderID, ProductID, na Quantity, kuandika SQL query kupata mapato ya jumla yanayotokana na kila mteja katika mwezi uliopita, ikiwa ni pamoja na mapato kutoka maagizo yote ambayo mteja imeweka, hata kama walikuwa kuwekwa katika tarehe tofauti.  <response>: Heres the SQL query to find the total revenue generated by each customer in the past month:SELECT Orders.CustomerID, SUMItems.Quantity Products.Price AS RevenueFROM OrdersJOIN Items ON Orders.OrderID Items.OrderIDJOIN Products ON Items.ProductID Products.ProductIDWHERE Orders.OrderDate DATEADDmonth, -1, GETDATEGROUP BY Orders.CustomerIDORDER BY Revenue DESC;This query joins the Orders, Items, and Products tables together based on the OrderID and ProductID columns. It then calculates the revenue for each order by multiplying the quantity of each item by the price of the product, and sums up the revenue for all orders placed by each customer in the past month. Finally, the results are grouped by customer and sorted in descending order of revenue. 