Example: I have an instrument that measures something (furnace temp, motor speed, etc) every second. Occasionally it fails to report the value. Find each second that it didn't report between date_x and date_y. What's the best way to answer that question? >>> This e-mail and any attachments are confidential, may contain legal, >>> professional or other privileged information, and are intended solely for >>> the addressee. If you are not the intended recipient, do not use the >>> information in this e-mail in any way, delete this e-mail and notify the >>> sender. CEG-IP1 -- //www.freelists.org/webpage/oracle-l