SCD Type 2 Implementation with merge and merge join.. How to handle Primary key with multiple records from same source file

Hi All,

The Data from the source file looks like below. These are the only columns and there are no additional date columns.

Customer IDCustomer NameSegmentPostal Code
AA-10375Allen ArmoldConsumer85204
AA-10375Allen ArmoldConsumer68104
AA-10375Allen ArmoldConsumer90008
AA-10375Allen ArmoldConsumer97301
AA-10375Allen ArmoldConsumer30318
AA-10375Allen ArmoldConsumer91730
AA-10375Allen ArmoldConsumer37087
AA-10375Allen ArmoldConsumer10035
AA-10375Allen ArmoldConsumer2908

The requirement is to implement SCD type 2 implementation with merge join and merge task in SSIS.  please suggest how i can Implement SCD type 2 and update effective from date and Effective To Date for the above data. 

Thanks

Balaji

balaji