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This week I had a problem creating diagrams in my database ( SQL Server 2014), it returned me an error message:
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.
And another message:
Some solution?
https://stackoverflow.com/a/2043693/4319922
– StatelessDev