Question

DELIMITER //
CREATE TRIGGER after_game_status AFTER UPDATE ON games
FOR EACH ROW 
BEGIN
    DECLARE player1,player2, score1, score2 INT DEFAULT NULL;
    IF ( NEW.status = 'finished') THEN
        SELECT account_id_player1, account_id_player2 INTO player1, player2 FROM games WHERE game_id = new.game_id;
        SELECT player1_score, player2_score INTO score1, score2 FROM scores WHERE game_id = new.game_id;
        IF( score1 > score2 ) THEN
            UPADTE games SET winner_account_id = player1 WHERE game_id = new.game_id;
        ELSE
            UPADTE games SET winner_account_id = player2 WHERE game_id = new.game_id;
        END IF;
    END IF;
END;
DELIMITER //

错误1064（42000）：您的SQL语法有错误；检查与您的MariaDB服务器版本相对应的手册，以在游戏附近使用正确的语法SET winner_account_id = player1 WHERE game_id = new.game_id;第9行的ELSE UP'

Answer 1

有一个错字UPADTE，应该是UPDATE。在IF和ELSE的两个地方都有错字。

有效查询将是：

IF( score1 > score2 ) THEN
    UPDATE games SET winner_account_id = player1 WHERE game_id = new.game_id;
ELSE
    UPDATE games SET winner_account_id = player2 WHERE game_id = new.game_id;
END IF;

如何创建获取值表格的触发器并更新其他表格

1 个答案: