Question

我在尝试创建触发器时遇到语法错误。我远离MySQL专家，但设法根据我在stackoverflow上找到的信息创建以下代码。触发器的目的是检查销售行是否与拍卖项目（而不是立即购买项目）相关，如果是，则计算销售价格的10％溢价（将溢价金额插入高级列）。 “listing_id”是列表和销售清单表之间的链接。

DELIMITER $$
CREATE TRIGGER add_premium
AFTER INSERT
   ON sales_listings FOR EACH ROW
BEGIN
   SET @listing_type := (SELECT listing_type
                     FROM listings
                     WHERE listings.listing_id = NEW.listing_id);
   IF @listing_type = 'auction' THEN
            NEW.premium = NEW.price * 0.1;
   ELSE
        NEW.premium = 0;
   END IF;
END$$
DELIMITER;

这是语法错误：

 #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.premium = NEW.price * 0.1;
   ELSE
            NEW.premium = 0;
   END IF;
' at line 9

我做错了什么？

Answer 1

作业必须以SELECT subjects.name,subjects.hours,careers.description...(choose the columns you want) FROM subjects INNER JOIN careers ON subjects.careers_id=careers.id;开头。

all_careers = mysql_query(get all the careers and corresponding career_id from the table);

MySQL触发语法错误（基于两个表，if语句）

1 个答案: