sum function with join between two date ranges - mysql

Question

hi friends i have two tables with name order and product order
CREATE TABLE `order` (
`order_num` int(11) NOT NULL AUTO_INCREMENT,
`date` date DEFAULT NULL,
`time` time DEFAULT NULL,
`cutomer_name` varchar(45) DEFAULT NULL,
PRIMARY KEY (`order_num`)
) ENGINE=InnoDB AUTO_INCREMENT=235 DEFAULT CHARSET=latin1
And
CREATE TABLE `product_order` (
`order_num` int(11) NOT NULL,
`idproduct` int(11) NOT NULL,
`quantity` tinyint(4) DEFAULT NULL,
`sub_price` int(11) DEFAULT NULL,
`price` int(11) DEFAULT NULL,
`actual_price` int(11) DEFAULT NULL,
PRIMARY KEY (`order_num`,`idproduct`),
KEY `fk_product_order_order1_idx` (`order_num`),
KEY `fk_product_order_product1_idx` (`idproduct`),
CONSTRAINT `fk_product_order_order1` FOREIGN KEY (`order_num`) REFERENCES `order` (`order_num`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_product_order_product1` FOREIGN KEY (`idproduct`) REFERENCES `product` (`idproduct`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
i want to join both table and want to retrieve the sum of product_order.actual_price,product_order.sub_price and product_order.quantity
between specific dates
my query return zero rows and i don't know how to solve this problem
here is my query
Select `order`.date,
Sum(product_order.actual_price) as actual_price_sum,
Sum(product_order.sub_price) as sub_price_sum,
Sum(product_order.quantity) as sold_quantity,
(Sum(product_order.sub_price)-Sum(product_order.actual_price)) as profit
From `order`
Inner Join product_order On `order`.order_num = product_order.order_num
WHERE CAST(`date` AS date) BETWEEN '2014-11-11' and '2015-11-11'
Group By `order`.date