For any given instance of an event (let’s say a failed login attempt), you can use LAG to determine how long it has been since the previous occurrence and execute business logic (like blocking the IP from trying again).
The matter of the fact, I have written about this in my earlier blog Introduction to LEAD and LAG – Analytic Functions Introduced in SQL Server 2012.


Let us quickly understand it in it with the help of script.For example here is the column where we want to get access to the previous row and the next row in SELECT statement.






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