Como se proteger contra DUPE..

Bloqueando os Baús de Duppers
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Código:
if exists (select * from dbo.sysobjects where id =
object_id(N'[dbo].[trg_CheckSameID]') and OBJECTPROPERTY(id,
N'IsTrigger') = 1) drop trigger [dbo].[trg_CheckSameID] GO
if exists (select * from dbo.sysobjects where id =
object_id(N'[dbo].[AllItemsLog]') and OBJECTPROPERTY(id,
N'IsUserTable') = 1) drop table [dbo].[AllItemsLog] GO
if exists (select * from dbo.sysobjects where id =
object_id(N'[dbo].[CopyLog]') and OBJECTPROPERTY(id, N'IsUserTable') =
1) drop table [dbo].[CopyLog] GO
CREATE TABLE [dbo].[AllItemsLog] ( [items_id] [int] IDENTITY (1, 1) NOT
NULL , [items_type] [binary] (1) NOT NULL , [items_serial] [binary] (4)
NOT NULL , [items_acid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT
NULL ) ON [PRIMARY] GO
CREATE TABLE [dbo].[CopyLog] ( [copy_id] [int] IDENTITY (1, 1) NOT NULL
, [copy_acid] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[copy_whdata] [binary] (1200) NOT NULL , [copy_date] [datetime] NOT
NULL ) ON [PRIMARY] GO
ALTER TABLE [dbo].[AllItemsLog] ADD CONSTRAINT [DF_CT_ITEM_item]
DEFAULT (0) FOR [items_type], CONSTRAINT [DF_CT_ITEM_itemid] DEFAULT
(0) FOR [items_serial], CONSTRAINT [DF_CT_ITEM_itemrole] DEFAULT ('')
FOR [items_acid] GO
CREATE INDEX [IX_CT_ITEM] ON [dbo].[AllItemsLog]([items_type],
[items_serial]) ON [PRIMARY] GO
ALTER TABLE [dbo].[CopyLog] ADD CONSTRAINT [DF_CopyLog_copy_date]
DEFAULT (getdate()) FOR [copy_date] GO SET QUOTED_IDENTIFIER ON GO SET
ANSI_NULLS ON GO