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我已经实现了如下存储过程，但是当我尝试应用它时收到以下错误消息：

ERROR 1064 (42000)：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以获取在 'WHERE symbol_id = id GROUP BY symbol_id; 附近使用的正确语法；

我做了一些调试，发现它是由我试图将结果写入的@max 变量引起的，但是我没有发现语法有任何问题，谁能告诉我？

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

$$ 分隔符；

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1 回答 1

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您的语法不正确SELECT ... INTO：

改变

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

到

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

应该在INTO之后SELECT和之前FROM

于 2013-07-20T15:32:25.537 回答