TRIGGER SQL SERVER

-- ================================================
-- Template generated from Template Explorer using:
-- Create Trigger (New Menu).SQL
--
-- Use the Specify Values for Template Parameters
-- command (Ctrl-Shift-M) to fill in the parameter
-- values below.
--
-- See additional Create Trigger templates for more
-- examples of different Trigger statements.
--
-- This block of comments will not be included in
-- the definition of the function.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

DROP  TRIGGER dbo.TestBase_change
GO

-- =============================================
-- Author:      RDEM
-- Create date:
-- Description:
-- =============================================
CREATE TRIGGER dbo.TestBase_change
   ON  dbo.TestBase
   AFTER 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
    INSERT INTO dbo.TestBaseVersioningExp(row_type,Id,NewDescription,OldDescription,CreatedAt)
    SELECT 'inserted',a.Id,a.Description,'',a.CreatedAt
    FROM inserted a
    WHERE NOT EXISTS (SELECT * FROM deleted WHERE id =a.Id )
    UNION ALL
    SELECT 'deleted',a.Id,'' ,a.Description,a.CreatedAt
    FROM deleted a
    WHERE NOT EXISTS (SELECT * FROM inserted WHERE id =a.Id )
    UNION ALL
    SELECT 'updated',a.Id,a.Description,b.Description,a.CreatedAt
    FROM inserted  a JOIN deleted b ON a.Id=b.Id
    WHERE EXISTS (SELECT * FROM deleted WHERE id =a.Id )
END
GO