sql-server-2005-express - 过程 tr_EMPLOYEE2_FORINSERT，第 10 行插入错误：列名或提供的值的数量与表定义不匹配

Question

ALTER TRIGGER tr_EMPLOYEE2_FORINSERT
ON EMPLOYEE2
FOR INSERT
AS
BEGIN
--  SELECT * FROM INSERTED --INSERTED Table is a special table created for the purposes of Triggers, it is available only in the context of the trigger.
    DECLARE @ID INT
    SELECT @ID = ID FROM INSERTED

    INSERT INTO EMPAUDIT
    VALUES('New Employee with id = ' + cast(@id as nvarchar(5)) + ' is added at  ' + cast(getdate() as nvarchar(20)))
END

Answer 1

一个。我们不知道你的EMPAUDIT桌子长什么样。但是假设它有不止一列（大多数表都有），你应该为你的INSERT语句使用一个列列表：

INSERT INTO EMPAUDIT (Column_To_Insert_Into)
VALUES('New Employee with id = ' + cast(@id as nvarchar(5)) +
       ' is added at  ' + cast(getdate() as nvarchar(20)))

湾。然而，扳机它居然还是坏了。为什么？因为inserted可以包含多行（或没有行）。所以实际上我们想要的是：

INSERT INTO EMPAUDIT (Column_To_Insert_Into)
SELECT 'New Employee with id = ' + cast(i.id as nvarchar(5)) +
       ' is added at  ' + cast(getdate() as nvarchar(20))
FROM inserted i

然后您不需要在触发器中编写的其余代码