为什么我在Mysql中运行SQL语句'declare'后返回错误？

Question

该表定义如下：

我尝试使用'declare'声明变量，但它总是引发错误，我不知道为什么。

代码：

mysql> DELEMITER //
mysql> CREATE PROCEDURE emp_age_count(IN age1 int,IN age2 int,OUT count INT)
        -> BEGIN
        -> DECLARE temp FLOAT;
        -> DECLARE emp_age CURSOR FOR SELECT empage FROM emp;
        -> DECLARE EXIT HANDLER FOR NOT FOUND
        -> CLOSE emp_age;
        -> SET @sum=0;
        -> SELECT COUNT(*) INTO count FROM emp
        -> WHERE empage>age1 AND empage<age2;
        -> OPEN emp_age;
        -> REPEAT
        -> FETCH emp_age INTO temp;
        -> IF temp>age1 AND temp<age2;
        -> THEN SET @sum=@sum+temp;
        -> END IF;
        -> UNTIL 0 END REPEAT;
        -> CLOSE emp_age;
        -> END//


    ERROR 1064 (42000): 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 ';
    THEN SET @sum=@sum+temp;
    END IF;
    UNTIL 0 END REPEAT;
    CLOSE emp_age;
    END' at line 13

Answer 1

请删除“;”在'IF'条件结束时

应该是

IF (temp>age1 AND temp<age2)
THEN
SET @sum=@sum+temp;
END IF;