Select 3 products (product name and order number) sold in the most quantity in one order (in MySQL)

Question

Whole db with all tables is in the LINK

I tried using this code:

SELECT Products.ProductName, OrderDetails.OrderID, SUM(Quantity) FROM Products
INNER JOIN OrderDetails ON Products.ProductID = OrderDetails.ProductID
GROUP BY ProductName
ORDER BY SUM(Quantity) DESC

But the result was wrong for sure...

Answer 1

You were almost there, and you need to group by two columns orderdetails.orderid and products.productid

SELECT products.productname,
       products.productid,
       orderdetails.orderid,
       Sum(quantity) AS MaxQuantity
FROM   products
       INNER JOIN orderdetails
               ON products.productid = orderdetails.productid
GROUP  BY orderdetails.orderid,
          products.productid
ORDER  BY maxquantity DESC LIMIT 0, 3