DoubleClick's subsequent promise not to integrate its own database fully with that of Abacus turns the acquisition, in the eyes of many, into a monumental flop.
You as a customer can use SQL and standard tools with Oracle applications, and the environment is secure (you can query, integrate, and backup the cloud at the database level, not the application level).
This means that if you want to integrate your system with other systems, like your website or accounting database or if you want to perform complex customizations (and have the expertise to do so) you can dig into the entrails of SugarCRM to make it do exactly what you want it to do.