Please indicate the name of the shipper that shipped most number of orders.

Please indicate the product category wise sales totals. Your query should show the category name and total sale value for that category.

Please indicate the name of the product that has most number of orders.

Customers CustomerId CustomerName ContactName Address City PostalCode Country Shippers Shipper ID Shipper Name Phone Orders OrderId Customer Id Employeeld OrderDate ShipperID Order Details Order DetailID Order ID ProductID Quantity Suppliers SupplierID SupplierName Contact Name Address City PostalCode Country Phone Products ProductID ProductName SupplierID categoryId Unit Price