如何在包含COUNT，MIN和MAX的查询中SUM两个（所有记录的）字段

Question

select count(productid) as totalproducts, min(price+shippingtouk) as lowerprice, max(price+shippingtouk) as upperprice  from tblproducts

有没有办法计算表格中所有记录的价格和出货量字段的总和？