相关疑难解决方法(0)

我想在MySQL中创建一个函数:

这是SQL代码:

CREATE FUNCTION F_Dist3D (x1 decimal, y1 decimal) 
RETURNS decimal
DETERMINISTIC
BEGIN 
 DECLARE dist decimal;
 SET dist = SQRT(x1 - y1);
 RETURN dist;
END;

我收到以下错误:

#1064 - You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL 
server version for the right syntax to use near '' at line 10

我在phpMyAdmin中运行此create语句.这个功能有什么问题？