相同的MySQL查询在MySQL Workbench中返回与命令行不同的结果

This query `

这个查询的

delimiter $$

CREATE DEFINER=`root`@`localhost` FUNCTION `calculatePrice`(cheese VARCHAR(50), meat VARCHAR(50), veg VARCHAR(50)) RETURNS decimal(10,0)
    DETERMINISTIC
BEGIN
DECLARE price DECIMAL;
SET price = (SELECT  SUM(x.Price) 
    FROM
    (
        SELECT `priceFactor` AS Price FROM `tblCheese` WHERE `cheeseName` = cheese
        UNION ALL 
        SELECT `priceFactor` AS Price FROM `tblMeat` WHERE `meatName` = meat 
        UNION ALL 
        SELECT `priceFactor` AS Price FROM `tblVeggie` WHERE `veggieName` = veg
    ) x );
RETURN price;
END$$

`
delimiter $$

CREATE DEF