函数创建不了,为什么?
mysql> CREATE FUNCTION f1() RETURNS VARCHAR(30) ->RETURN DATE_FORMAT(NOW(),'%Y年%m月%d日 %H点:%i分:%s 秒'); ERROR 1418 (HY000): 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)