CREATE PROCEDURE even_numbers() BEGIN DECLARE x INT DEFAULT 0; DECLARE result VARCHAR(100) DEFAULT ''; WHILE x < 10 DO SET x = x + 2; IF x > 10 THEN LEAVE; END IF; IF x % 2 <> 0 THEN CONTINUE; END IF; SET result = CONCAT(result, x, ','); END WHILE; SELECT TRIM(TRAILING ',' FROM result); END 此代码报错: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 '; END IF; IF x % 2 <> 0 THEN CONTINUE; ' at line 10

这个错误可能是因为你的MySQL版本不支持在存储过程中使用`IF`语句的简写形式。你可以将`IF x % 2 <> 0 THEN`改为`IF NOT x % 2 = 0 THEN`，即完整形式的写法，然后再次尝试执行存储过程。以下是修改后的代码：

DELIMITER //

CREATE PROCEDURE even_numbers()
BEGIN
    DECLARE x INT DEFAULT 0;
    DECLARE result VARCHAR(100) DEFAULT '';

    WHILE x < 10 DO
        SET x = x + 2;

        IF x > 10 THEN
            LEAVE;
        END IF;

        IF NOT x % 2 = 0 THEN
            CONTINUE;
        END IF;

        SET result = CONCAT(result, x, ',');
    END WHILE;

    SELECT TRIM(TRAILING ',' FROM result);
END //

DELIMITER ;

如果还是有问题，请检查一下你的MySQL版本是否符合要求。