select EmployeeID, LastName+''+FirstName, ProductName, kolvo
from Employees cross apply
(
select top(3) ProductName, sum(O.Quantity) as kolvo
from Orders join [Order Details] on Orders.OrderID=[Order Details].OrderID,
[Order Details] O join Products on O.ProductID=Products.ProductID
where Employees.EmployeeID=Orders.EmployeeID
group by ProductName
order by sum(O.Quantity)
) Customer
Order by EmployeeID