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SQL SERVER – Database diagram support objects cannot be installed because this database does not have a valid owner

This is one of the common error message developer face while creating DB diagram.

Error Screen:











Solution :

Solution is simple one, run following script to  ALTER AUTHORIZATION for your DB.

-- Replace DB_Name : to your DB
ALTER AUTHORIZATION ON DATABASE::DB_Name TO sa
GO

Or you can Alter Authorization with designer with following steps:
  • Right Click on your DB and Select Properties
  • Select Files (second option from left side pane).
  • In the OWNER box, click on button to add user(reference: below fig.).
  • Now select user ‘sa’ and click OK.




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