帮助从 MySQL 触发器中删除别名

Question

我的问题太简单了（我猜），下面是我试图删除别名的触发器示例。我不知道我做错了什么，我就是做错了。

DELIMITER @
CREATE TRIGGER StartOfShift BEFORE INSERT ON shift
FOR EACH ROW
BEGIN
IF(NEW.CashierCode NOT IN ( SELECT w.EmployeeID FROM WorksOn as w
JOIN shop AS s ON w.ShopID = s.ShopID
JOIN CashMachineCode AS c ON s.ShopID = c.ShopID
WHERE c.CashMachineCode = NEW.CashMachineCode ))
THEN SET NEW.CashierCode = NULL;
END IF;
END;

Answer 1

以下应该是您正在寻找的内容：

DELIMITER @
CREATE TRIGGER StartOfShift BEFORE INSERT ON shift
FOR EACH ROW
BEGIN
    IF(NEW.CashierCode NOT IN ( 
        SELECT WorksOn.EmployeeID FROM WorksOn
            JOIN shop ON WorksOn.ShopID = shop.ShopID
            JOIN CashMachineCode ON shop.ShopID = CashMachineCode.ShopID
            WHERE CashMachineCode.CashMachineCode = NEW.CashMachineCode )
    ) THEN 
        SET NEW.CashierCode = NULL;
    END IF;
END@
DELIMITER ;