TOP 100 in SQL

How to display only first 100 rows from a query ??? Please help Select a, sum(b) group by a DESC __________________________________________________ This message is intended only for the use of the=20 Addressee and may contain information that is=20 PRIVILEGED and CONFIDENTIAL=2E If you are not the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited=2E If you have received this communication in error, please erase all copies of the message and its attachments and notify us immediately=2E Thank You=2E __________________________________________________