This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Are you trying to do it in a single SQL statement or in PLSQL such as in a stored procedure? Also is the range part of the input parameters? Such as if I set 7 it should do 0-7, 7-14, etc instead of increments of 5?