Update Base File from Reading New Input

Hi, 

I need to create a flow that will let me read a new file, compare it to a base file, and then either update or add the information to the base file.

My base file looks like this:

ID                                First Date                   Latest Date              First Score               Latest Score

5834803                     22/07/2017                 --                               2                              --

And the new files look like this:

ID                            Date                    Score

39548397                23/07/2017         3

5834803                   22/07/2017        2

As can be seen, I need to update the base file with the new information relating to one ID and add other IDs that were not previously included. 

I'm quite new to KNIME and a little bit lost, so any suggestions would be much appreciated.

Thank you :)