SAN FRANCISCO, CA--(Marketwired - Jun 5, 2013) - Embarcadero Technologies announced today it is hosting an online event titled "New SQL Server 2012 Functions" featuring SQL Server expert Rick Morelan.

I want to design a query to compute some returns for stock data and in searching the 'SQL Server Books Online' I find a very small and not so helpful at all help section on the lead and lag functions.