stored procedure error message - mysql

Question

I have implemented the stored procedure as below, however i am getting the following error message when i try applying it:
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 'WHERE symbol_id = id GROUP BY symbol_id;
I did some debugging and found that it was caused by the #max variable which i am trying to write the result into, however i do not see anything wrong with the syntax, can anyone please advise?
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

You have incorrect syntax in your SELECT ... INTO:
Change
SELECT SUM(quantity)
FROM trade
INTO #max -- Incorrect placement
WHERE symbol_id = id
GROUP BY symbol_id;
To
SELECT SUM(quantity)
INTO #max -- Correct placement
FROM trade
WHERE symbol_id = id
GROUP BY symbol_id;
The INTO should come right after the SELECT and before the FROM