The challenge is to compare the data of the rows and group the input data. The data needs to be grouped based on the Product ID, Date, TotalLines, LinesOutOfService. You need to check each row in the table to see if that particular product has the different range of values for TotalLines and Linesoutofservice when compared to the rows below. If yes, then insert that date where a different range is encountered into the "End Date" column. If no change in the values are detected then insert a future date "01/12/2050".
This problem is related to a reservation system where customers book a service and pay it in one or more transactions which may happen on different dates.