SQL - प्रक्रिया स्तंभ त्रुटि

DROP PROCEDURE IF EXISTS `LIST`;
DELIMITER $$
create procedure LIST(in tableName varchar(35))
BEGIN 
    SET @sql=CONCAT('select * from ',tablename);
    PREPARE stmt1 FROM @sql;
    EXECUTE stmt1;
    DEALLOCATE PREPARE stm1;
END$$

परीक्षण:

call LIST('course');
call LIST('tutor');