Nov 28 - Fitch Ratings has assigned a 'BBB+' rating to the Dun & Bradstreet Corporation's (D&B) proposed senior unsecured note offering due 2017 and 2022. Proceeds from the issuance are expected to be used to redeem or repurchase all of the $400 million 6% senior notes due April 2013 and reduce credit facility borrowings ($320 million outstanding as of Sept. 30, 2012). Fitch currently has a 'BBB+' Issuer Default Rating (IDR) for D&B. The Rating Outlook is Negative. A full rating list is provided