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if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[圖書丟失_圖書編號_fk]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書丟失] DROP CONSTRAINT 圖書丟失_圖書編號_fk
GO
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[FK_圖書罰款_圖書信息]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書罰款] DROP CONSTRAINT FK_圖書罰款_圖書信息
GO
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[圖書歸還_圖書編號_fk]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書歸還] DROP CONSTRAINT 圖書歸還_圖書編號_fk
GO
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[圖書借閱_圖書編號_fk]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書借閱] DROP CONSTRAINT 圖書借閱_圖書編號_fk
GO
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[FK_圖書征訂_圖書信息]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書征訂] DROP CONSTRAINT FK_圖書征訂_圖書信息
GO
if exists (select * from dbo.sysobjects where id = object_id(N\'[dbo].[圖書注銷_圖書編號_fk]\') and OBJECTPROPERTY(id, N\'IsForeignKey\') = 1)
ALTER TABLE [dbo].[圖書注銷] DROP CONSTRAINT 圖書注銷_圖書編號_fk
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