TITLE: Microsoft SQL Server Management Studio
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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.
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Çözüm olarak şu sorguyu çalıştırabilirsiniz
EXEC sp_dbcmptlevel 'yourDB', '90'; go ALTER AUTHORIZATION ON DATABASE::yourDB TO yourLogin go use [yourDB] go EXECUTE AS USER = N'dbo' REVERT go