I am dealing with log files which are structured as follows TimeStamp=1 SessionHandle=1 SessionEvent=A TimeStamp=2 SessionHandle=1 SessionEvent=B TimeStamp=3 SessionHandle=1 SessionEvent=C TimeStamp=4 SessionHandle=1 SessionEvent=D TimeStamp=5 SessionHandle=1 SessionEvent=E TimeStamp=6 SessionHandle=1 SessionEvent=F TimeStamp=7 SessionHandle=1 SessionEvent=G TimeStamp=8 SessionHandle=1 SessionEvent=H TimeStamp=10 SessionHandle=2 SessionEvent=A TimeStamp=11 SessionHandle=2 SessionEvent=B TimeStamp=12 SessionHandle=2 SessionEvent=C TimeStamp=13 SessionHandle=2 SessionEvent=D TimeStamp=14 SessionHandle=2 SessionEvent=E TimeStamp=15 SessionHandle=2 SessionEvent=F TimeStamp=16 SessionHandle=2 SessionEvent=G TimeStamp=17 SessionHandle=2 SessionEvent=H I want to calculate duration between various events for each session For ex: timediff between B & A, similarly H-A, H-D, A-F etc for each session separately and display results in single table ... View more