产品折扣 这是对product_table的查询创建表product_data ( ID int(11)NOT NULL AUTO_INCREMENT, p_name varchar(56)NOT NULL, p_price int(11)NOT NULL, p_desc text NOT NULL, qty int(11)NOT NULL, discount int (11)NOT NULL, total int(11)NOT NULL,PRIMARY KEY( ID ))ENGINE = InnoDB DEFAULT CHARSET = latin1