Disabling foreign key constraint, still can't truncate table? (SQL Server 2005)

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I have a table called PX_Child that has a foreign key on PX_Parent. I'd like to temporarily disable this FK constraint so that I can truncate PX_Parent. I'm not sure how this goes however.

I've tried these commands

ALTER TABLE PX_Child NOCHECK CONSTRAINT ALL

ALTER TABLE PX_Parent NOCHECK CONSTRAINT ALL

(truncate commands)

ALTER TABLE PX_Child CHECK CONSTRAINT ALL

ALTER TABLE PX_Parent CHECK CONSTRAINT ALL

But the truncate still tells me it can't truncate PX_Parent because of a foreign key constraint. I've looked all around the net and can't seem to find what I'm doing wrong, sorry for the basic nature of this question.

constraints foreign-keys sql-server
4 Answers

There is no such option to truncate table while foreign key constraint but we can use some trick like

 ALTER TABLE [dbo].[table2] DROP CONSTRAINT [FK_table2_table1]
    GO
    truncate table [table1]
GO
    ALTER TABLE [dbo].[table2]  WITH CHECK ADD  CONSTRAINT [FK_table2_table1] FOREIGN KEY([FKId])
    REFERENCES [dbo].[table1] ([ID])
    GO

    ALTER TABLE [dbo].[table2] CHECK CONSTRAINT [FK_table2_table1]
    GO
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