请教触发该怎么写

不知怎么用
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:        <Author,,Name>
-- Create date: <Create Date,,>
-- Description:    <Description,,>
-- =============================================
CREATE TRIGGER <Schema_Name, sysname, Schema_Name>.<Trigger_Name, sysname, Trigger_Name>
   ON  <Schema_Name, sysname, Schema_Name>.<Table_Name, sysname, Table_Name>
   AFTER <Data_Modification_Statements, , INSERT,DELETE,UPDATE>
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for trigger here

END
GO

以上是数据库中新建触发器中默认的。

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假如SEQUENCE=4 这一行删除 如何添加删除触发使得 下面 5,6,7等自动减去1
还有如何放一个update触发，使得将4手动改成5后 5,6,7等自动加上1.