Incorrect syntax near '='.

I am trying to change occurences of 'NULL' in field ShippingAddressId to value 1
I get the following error:Msg 102, Level 15, State 1, Line 2
Incorrect syntax near '='.
The code I have is below:
Thanks in advance for any help given.
USE [CorpWear265_Restore_TestAlt]
UPDATE dbo.[Order] SET ShippingAddressId =  CASE WHEN ShippingAddressId IS NULL THEN ShippingAddressId = 1
END
SELECT TOP 4000 [Id]
	  ,[OrderGuid]
      ,[CustomerId]
      ,[BillingAddressId]
      ,[ShippingAddressId]
      ,[OrderStatusId]
      ,[ShippingStatusId]
      ,[PaymentStatusId]
      ,[PaymentMethodSystemName]
      ,[CustomerCurrencyCode]
      ,[CurrencyRate]
      ,[CustomerTaxDisplayTypeId]
      ,[VatNumber]
      ,[OrderSubtotalInclTax]
      ,[OrderSubtotalExclTax]
      ,[OrderSubTotalDiscountInclTax]
      ,[OrderSubTotalDiscountExclTax]
      ,[OrderShippingInclTax]
      ,[OrderShippingExclTax]
      ,[PaymentMethodAdditionalFeeInclTax]
      ,[PaymentMethodAdditionalFeeExclTax]
      ,[TaxRates]
      ,[OrderTax]
      ,[OrderDiscount]
      ,[OrderTotal]
      ,[RefundedAmount]
      ,[RewardPointsWereAdded]
      ,[CheckoutAttributeDescription]
      ,[CheckoutAttributesXml]
      ,[CustomerLanguageId]
      ,[AffiliateId]
      ,[CustomerIp]
      ,[AllowStoringCreditCardNumber]
      ,[CardType]
      ,[CardName]
      ,[CardNumber]
      ,[MaskedCreditCardNumber]
      ,[CardCvv2]
      ,[CardExpirationMonth]
      ,[CardExpirationYear]
      ,[AuthorizationTransactionId]
      ,[AuthorizationTransactionCode]
      ,[AuthorizationTransactionResult]
      ,[CaptureTransactionId]
      ,[CaptureTransactionResult]
      ,[SubscriptionTransactionId]
      ,[PurchaseOrderNumber]
      ,[PaidDateUtc]
      ,[ShippingMethod]
      ,[ShippingRateComputationMethodSystemName]
      ,[Deleted]
      ,[CreatedOnUtc]
      ,[ShippedDateUtc]
      ,[DeliveryDateUtc]
      ,[OrderWeight]
      ,[TrackingNumber]
      ,[OrderEnquiry]
FROM [CorpWear265_Restore_TestAlt].[dbo].[Order]

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homeshopperAsked:
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PortletPaulfreelancerCommented:
I would suggest:

UPDATE dbo.[Order]
SET ShippingAddressId =  1
WHERE  ShippingAddressId IS NULL
;

but the error was the case expression which should have been:

CASE WHEN ShippingAddressId IS NULL THEN 1 END
0

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homeshopperAuthor Commented:
Thank you for your suggestion, that works.
Now I wanted to assign ShippingAddress to CustomerId value when it is Null.
I get the following error:The UPDATE statement conflicted with the FOREIGN KEY constraint
The new code I have is:
UPDATE dbo.[Order]
SET ShippingAddressId =  CustomerId
WHERE  ShippingAddressId IS NULL
Thanks for the help.
0
homeshopperAuthor Commented:
Thankyou for the suggestion, I got the second query to work using the following:
ALTER TABLE dbo.[Order] NOCHECK CONSTRAINT ALL
0
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Microsoft SQL Server 2008

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