This is the fourth post in the series of finding previous row and next row value in SELECT Statement. Read all the blog post before continuing reading this blog post for complete idea.

In the very first part I discussed that performance with the help of CTE is very poor and I encouraged users to use LEAD and LAG function of SQL Server 2012. My friend and SQL Server Expert Szymon Wojcik have written a fantastic post about this subject. I encourage everyone to read that blog post. He has demonstrated that with the help of numbers table, we can further improve the performance of the query.