Question

Question is not correctly framed i know, how do i code the below logic in T-SQL (SQL Server 2005) to increase a failure count for user registration system.

SELECT  CASE WHEN (FailedPasswordWindowStart < GETDATE() >= 
dateadd(minute,20,FailedPasswordWindowStart)) THEN 'Increase' ELSE 'Same' END FROM users

simply put, when the current time is within last attempt and time windows from last attempt then increase the failure count.

Answer 1

Here is a more easier way i could have done this. replace the variables as parameters to the stored procedure you might have created.

SELECT 
CASE WHEN ABS((DATEDIFF(MINUTE,@LastAttempt,GETDATE())) <= @TimeWindow
THEN 'Increase' 
ELSE 'Same' END

@Window – Time window within which the if a attempt is made should increase the count

@LastAttempt – Last failure attempt(date and time)

Edit

added ABS since the value obtained could be negative too 🙂