> It's not for deleting all your friends when your account is deleted. Very nice summary up until that point. But in a well normalized db the friends relations

> It's not for deleting all your friends when your account is deleted. Very nice summary up until that point. But in a well normalized db the friends relationship (many-to-many) would be its own table. Friend relationships with the deleted user would be deleted, as they should be. Friends would not. (You still have time to edit for a better example.)