Need to check for new entries in the Data base and extract corresponding data

Hi all,

Plz help me in the following case. My project is stuck
Problem statement
Need to check for case numbers in my new data base and the corresponding version numbers( two different column comparison
) and see if it is a new entry( ie it is not repeating in my old data base). If it is a new entry I need it to extract the corresponding employee name from my new data base. PFA a sample scenario.