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你能告诉我我的mysql函数有什么问题吗？

DELIMITER //
CREATE FUNCTION avgRating( ide int(11), ident bool ) RETURNS float
BEGIN
IF ident!=1 THEN

RETURN (
SELECT SUM(RatingVal)/Count(*) 
FROM ratings WHERE id=ide
GROUP BY id
);
ELSE RETURN (
SELECT SUM(RatingVal)/Count(*) 
FROM ratings WHERE id=ide
GROUP BY id);
END IF;
END //
DELIMITER ;

导入文件后来自 phpMyAdmin 的错误：

        Error
There seems to be an error in your SQL query. The MySQL server error output below, if there is any, may also help you in diagnosing the problem

ERROR: Unknown Punctuation String @ 104
STR: //
SQL: DROP FUNCTION IF EXISTS `avgRating`;# MySQL returned an empty result set (i.e. zero rows).

DELIMITER //
CREATE FUNCTION `avgRating`( ide int(11), ident bool ) RETURNS float
BEGIN
    IF ident!=1 THEN

    RETURN (
    SELECT SUM(RatingVal)/Count(*) 
    FROM ratings WHERE id=ide
    GROUP BY id
    );
    ELSE RETURN (
    SELECT SUM(RatingVal)/Count(*) 
    FROM ratings WHERE id=ide
    GROUP BY id);
    END IF;
END //

DELIMITER //
CREATE FUNCTION `avgRating`( ide int(11), ident bool ) RETURNS float
BEGIN
    IF ident!=1 THEN

    RETURN (
    SELECT SUM(RatingVal)/Count(*) 
    FROM ratings WHERE id=ide
    GROUP BY id
    );
    ELSE RETURN (
    SELECT SUM(RatingVal)/Count(*) 
    FROM ratings WHERE id=ide
    GROUP BY id);
    END IF;
END //


SQL query: 

DELIMITER // CREATE FUNCTION `avgRating`( ide int(11), ident bool ) RETURNS float BEGIN IF ident!=1 THEN RETURN ( SELECT SUM(RatingVal)/Count(*) FROM ratings WHERE id=ide GROUP BY id ); ELSE RETURN ( SELECT SUM(RatingVal)/Count(*) FROM ratings WHERE id=ide GROUP BY id); END IF; END //

MySQL said: 

#1418 - This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)
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