I encountered the error below when creating a diagram in the Management Studio.
"Database diagram support objects cannot be installed because this database does not have a valid owner. To continue, first use the Files page of the Database Properties dialog box or the ALTER AUTHORIZATION statement to set the database owner to a valid login, then add the database diagram support objects."
Solution:
Execute the following line in SQL Server Management Studio Express Query
ALTER AUTHORIZATION ON DATABASE::DATABASE_NAME TO "Your_User"
"Database diagram support objects cannot be installed because this database does not have a valid owner. To continue, first use the Files page of the Database Properties dialog box or the ALTER AUTHORIZATION statement to set the database owner to a valid login, then add the database diagram support objects."
Solution:
Execute the following line in SQL Server Management Studio Express Query
ALTER AUTHORIZATION ON DATABASE::DATABASE_NAME TO "Your_User"
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