Question

我已经实现了如下的存储过程，但是当我尝试应用它时，我收到以下错误消息：

错误1064（42000）：您的SQL语法出错;检查与MySQL服务器版本对应的手册，以便在'WHERE symbol_id = id GROUP BY symbol_id;

附近使用正确的语法

我做了一些调试，发现它是由@max变量引起的，我试图将结果写入，但是我没有看到语法有什么问题，有人可以建议吗？

DROP PROCEDURE IF EXISTS `GENERATE_REPORT`;
DELIMITER $$
CREATE DEFINER=CURRENT_USER PROCEDURE `GENERATE_REPORT`()
BEGIN
    DECLARE id INT;
    DECLARE max INT;
    DECLARE at_end BIT DEFAULT 0;
    DECLARE cur CURSOR
        FOR SELECT symbol_id from trade;
        DECLARE CONTINUE HANDLER
        FOR SQLSTATE '02000' SET at_end=1;

    OPEN cur;
    FETCH cur INTO id;
    WHILE (NOT at_end) DO
        SELECT SUM(quantity) FROM trade INTO **@max** WHERE symbol_id = id GROUP BY symbol_id;
        FETCH cur into id;
    END WHILE;
    CLOSE cur;
END

$$ DELIMITER;

Answer 1

SELECT ... INTO中的语法不正确：

更改

SELECT SUM(quantity)
FROM trade 
INTO @max -- Incorrect placement
WHERE symbol_id = id
GROUP BY symbol_id;

要

SELECT SUM(quantity)
INTO @max -- Correct placement
FROM trade  
WHERE symbol_id = id
GROUP BY symbol_id;

INTO应该在SELECT之后和FROM之前

存储过程错误消息

1 个答案: