Sql server 使用Inserted时，“插入后”触发器不起作用

我试图在Employees表中写入一个触发器，该触发器不允许插入一个新员工，该新员工的雇佣日期早于其上司的雇佣日期

CREATE TABLE [dbo].[Employees]
(
    [EID] [int] IDENTITY(1,1) NOT NULL,
    [Ename] [nvarchar](20) NOT NULL,
    [Gender] [nvarchar](1) NOT NULL,
    [IsMarried] [nvarchar](1) NOT NULL,
    [Birthdate] [date] NOT NULL,
    [HireDate] [date] NOT NULL,
    [Salary] [float] NOT NULL,
    [Notes] [nvarchar](200) NULL,
    [NationalityID] [int] NULL,
    [BossID] [int] NULL,

    CONSTRAINT [PK_Employees] 
        PRIMARY KEY CLUSTERED ()
)

这是触发代码：

CREATE TRIGGER [dbo].[Trig_04]
ON [dbo].[Employees]
AFTER INSERT
AS 
BEGIN
    IF ((SELECT INSERTED.HireDate FROM INSERTED WHERE BossID <> EID) < 
        (SELECT Employees.HireDate FROM Employees 
         WHERE EID IN (SELECT Employees.BossID FROM Employees WHERE BossID <> EID)))
        ROLLBACK
END

---

它正常执行时没有错误，但不工作，但是当我在子查询中使用employees表而不是插入的表时，它工作正常。有人对此有答案吗？

您必须在SQL Server中编写触发器，以处理插入的数据可能包含多条记录这一事实。你不能假设它只是一条记录。我认为以下是您正在寻找的：

if exists (
  select 1
  from Inserted I
  where I.BossID <> I.EID
  and I.HireDate < (select E.HireDate from Employees E where E.EID = I.BossID)
) begin
    ROLLBACK;
end

---

您必须在SQL Server中编写触发器来处理插入的数据可能包含多条记录的事实。你不能假设它只是一条记录。我认为以下是您正在寻找的：

if exists (
  select 1
  from Inserted I
  where I.BossID <> I.EID
  and I.HireDate < (select E.HireDate from Employees E where E.EID = I.BossID)
) begin
    ROLLBACK;
end

---

@萨拉西布利尼-这有帮助吗？@萨拉西布利尼-这有帮助吗？