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how do you update rows and not violate a PK on the table?

Last Modified: 2012-05-05
i have the following SQL:

UPDATE Products_ProductComponents
SET Products_ProductComponents.ComponentID = products_list_ORIG.derivedFrom
FROM Products_ProductComponents
      INNER JOIN products_list_ORIG ON products_list_ORIG.ProductID = Products_ProductComponents.ComponentID
WHERE products_list_ORIG.derivedFrom <> 0

the updated sets values in the PM that already exist and i get this error:
Violation of PRIMARY KEY constraint 'PK_Products_ProductComponents'. Cannot insert duplicate key in object 'dbo.Products_ProductComponents'.

how do i get around this?
i am thi nking i can update only records that will not violate the PK
or remove the PK, then delete dups then add PK back.

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