The primary key or UNIQUE constraint cannot be changed until its existing relationships are deleted. (Visual Database Tools)
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The primary key or UNIQUE constraint cannot be changed until its existing relationships are deleted. (Visual Database Tools)

You cannot change a table's primary key or unique constraint while other foreign key relationships are still in place. To change a table's primary key or unique constraint, first delete all existing relationships for the table.

For more information, see How to: Delete Relationships (Visual Database Tools).

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