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我想在MySQL中建立一個功能更大價值,我想返回值(出兩個值),這是更大的。 在我的代碼,這些值在變量X和Y,這裏是我的代碼:MySQL的功能 - 讓使用IF語句
DELIMITER ;;
CREATE FUNCTION getMaxDistanceById(id int(11))
RETURNS INT
BEGIN
DECLARE X INT DEFAULT 0;
DECLARE Y INT DEFAULT 0;
SELECT MAX(distance) INTO X FROM trainings WHERE user_id = id;
SELECT MAX(trainings.distance) INTO Y FROM trainings INNER JOIN attendings ON trainings.tid = attendings.tid WHERE attendings.uid = id;
IF X <= Y THEN
SET X = Y;
RETURN X;
END
;;
而在phpMyAdmin執行此語句,我得到的錯誤是:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 12
我希望有人知道該怎麼做了正確的方式,我會分享答案:)
非常感謝您,加入END IF解決了問題,並且簡化後的表達式完美無缺! :) – gorczyca94