I have cleared SCWCD (310-083) 15 days back and still not received certificate from SUN. I have a question. Will SUN provide certificate if only 310-083 is cleared or one needs to clear all upgrade exams to get the certificate.
You don't need to do the upgrade to get your certificate. It sometimes take some time until people receive theirs. Give it another one or two weeks, and contact Oracle if you still haven't received yours.