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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