在第35行''附近使用的正确语法

Question

谢谢大家，我编辑了这个问题。

我收到以下错误：＃1064 - 您的SQL语法出错;检查与MySQL服务器版本对应的手册，以便在第35行附近使用正确的语法

DELIMITER $$
CREATE FUNCTION `distance`(Q_LAT FLOAT, Q_LONG FLOAT, NAV_LAT FLOAT, NAV_LONG FLOAT)  RETURNS float
BEGIN
DECLARE radlat1 FLOAT;
DECLARE radlat2 FLOAT;
DECLARE radlon1 FLOAT;
DECLARE radlon2 FLOAT;
DECLARE theta FLOAT;
DECLARE radtheta FLOAT;
DECLARE dist FLOAT;
DECLARE PI FLOAT;

SET PI = PI();
SET dist = 0;

IF ((Q_LAT IS NULL OR Q_LAT = 0) OR (Q_LONG IS NULL OR Q_LONG = 0)
    OR (NAV_LAT IS NULL OR NAV_LAT = 0) OR (NAV_LONG IS NULL OR NAV_LONG = 0)) THEN
    RETURN dist;
ELSE
    SET radlat1 = PI * (Q_LAT/180);
    SET radlat2 = PI * (NAV_LAT/180);
    SET radlon1 = PI * (Q_LONG/180);
    SET radlon2 = PI * (NAV_LONG/180);
    SET theta = Q_LONG-NAV_LONG;
    SET radtheta = PI * (theta/180);
    SET dist = SIN(radlat1) * SIN(radlat2) + COS(radlat1) * COS(radlat2) * COS(radtheta);
    SET dist = ACOS(dist);
    SET dist = dist * (180/PI);
    SET dist = dist * 60 * 1.1515;
    SET dist = dist * 1.609344;

    SET dist = CEILING(dist);

RETURN dist;
END IF;
END$$