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9.0

Create foreign key constraint with no check

Asked by topazg in MS SQL Server

Tags: foreign, key, constraint, check

Dear all,

I am in process of testing installation scripts, and have a problem creating a foreign key constraint with "no check" against it. The following is a snippet from my foreign key constraint building script:

ALTER TABLE [dbo].[product_mailing_region] ADD
      CONSTRAINT [FK_product_mailing_region_product] FOREIGN KEY
      (
            [product_id]
      ) REFERENCES [dbo].[product] (
            [product_id]
      ),
      CONSTRAINT [FK_product_mailing_region_region] FOREIGN KEY
      (
            [region_id]
      ) REFERENCES [dbo].[region] (
            [region_id]
      ),
      CONSTRAINT [FK_product_mailing_region_mailing_type] FOREIGN KEY
      (
            [mailing_type_id]
      ) REFERENCES [dbo].[mailing_type] (
            [mailing_type_id]
      ) NOT FOR REPLICATION
GO

alter table [dbo].[product_mailing_region] nocheck constraint [FK_product_mailing_region_mailing_type]
GO

Now this works fine if there is no data in the database, but it cannot create FK_product_mailing_region_mailing_type in the first place if there is data in the product_mailing_region table without a valid mailing_type_id. How can I incorporate this nocheck attribute into the creation of the foreign key constraint itself?

Best Regards,
- Graham

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20091111-EE-VQP-89

Create foreign key constraint with no check

Asked by topazg in MS SQL Server

Tags: foreign, key, constraint, check

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