Select e.LastName from Products as p
			join [Order Details] as od
				on p.ProductID = od.ProductID
			Join Orders as o
				on o.OrderID= od.OrderID
			join Employees as e
				on e.EmployeeId=o.EmployeeID
			join suppliers as s
				on s.SupplierId=p.SupplieriD
		group by e.LastName
		having count(distinct s.SupplierId)>7