SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tblUser]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[tblUser](
	[UserID] [int] IDENTITY(1,1) NOT NULL,
	[UserName] [varchar](50) NOT NULL,
 CONSTRAINT [PK_tblUser] PRIMARY KEY CLUSTERED 
(
	[UserID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tblBook]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[tblBook](
	[BookID] [int] IDENTITY(1,1) NOT NULL,
	[BookTitle] [varchar](50) NOT NULL,
	[ModifiedByID] [int] NOT NULL,
	[ModifiedByName] [varchar](50) NULL,
	[ModifiedDate] [datetime] NOT NULL CONSTRAINT [DF_tblBook_ModifiedDate]  DEFAULT (getdate()),
 CONSTRAINT [PK_tblBook] PRIMARY KEY CLUSTERED 
(
	[BookID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
END
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

IF NOT EXISTS (SELECT * FROM sys.triggers WHERE object_id = OBJECT_ID(N'[dbo].[trg_tblBook_Update]'))
EXEC dbo.sp_executesql @statement = N'
CREATE TRIGGER [dbo].[trg_tblBook_Update]
   ON  [dbo].[tblBook]
   AFTER UPDATE
AS 
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

	update tblBook set ModifiedByName=usr.UserName
	from tblBook book join tblUser usr on usr.userid=book.ModifiedByID
		join Inserted i on i.bookid=book.bookid

END
' 
GO
IF NOT EXISTS (SELECT * FROM sys.foreign_keys WHERE object_id = OBJECT_ID(N'[dbo].[FK_tblBook_tblUser]') AND parent_object_id = OBJECT_ID(N'[dbo].[tblBook]'))
ALTER TABLE [dbo].[tblBook]  WITH CHECK ADD  CONSTRAINT [FK_tblBook_tblUser] FOREIGN KEY([ModifiedByID])
REFERENCES [dbo].[tblUser] ([UserID])
GO
ALTER TABLE [dbo].[tblBook] CHECK CONSTRAINT [FK_tblBook_tblUser]