Find data entry changes from one day to the next day

[kernal]

I'm using Crystal 9 with csv files. CLASS_csv and CLASS_NEW_csv. I'm trying to show what data entry changes were made.

Friday Data: CLASS_csv
class pattern_nbr days start_time start_date
101 1 M W 10:00 10/20/2014

102 1 T 09:00 10/21/2014
102 2 F 10:00 10/24/2014

103 1 M W 10:00 10/20/2014
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Monday Data: CLASS_NEW_csv
class pattern_nbr days start_time start_date
101 1 M 09:00 10/20/2014
101 2 W 10:00 10/22/2014

102 1 T F 09:00 10/21/2014

103 1 M W 10:00 10/20/2014
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I need the report to show:

class pattern_nbr days start_time start_date
NOW: 101 1 M 09:00 10/20/2014
101 2 W 10:00 10/22/2014
WAS: 101 1 M W 10:00 10/20/2014


NOW: 102 1 T F 09:00 10/21/2014
WAS: 102 1 T 09:00 10/21/2014
102 2 F 10:00 10/24/2014

I wouldn't want class 103 to show since there weren't changes.
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I have the CLASS_NEW_csv left outer joined = to CLASS_csv on the class field. I'm not sure how to go on from there (grouping, etc.)

Help is appreciated!

Thanks