How to set from and to date correctly on an incremental ETL for grouping granuality

Hi,
I have a principle design question that is relevant for any ETL tool.
I have a three field record with Id,groupId, timeKey
For example records can be:
1,1,01012014
2,1,01012014
3,1,01022014
I need to group the records to on groupId according to increment timekey.
Select groupId
where timekey = 010102014
The groupId needs to be a primary Key
The issue is - That there will always be records that will be split by the timekey in the increment load, and then the situation can be that the groupId will get duplicate.
In this example - groupId 1 will be selected twice for two different timekeys.
So the question is - What can be a best practice for avoiding the above situation in the increment load ?

How can GroupID be a primary key. As per the displayed sample it will never be PK. As I understand its a group identifier so you're going to have same id for all records within a group. Ideally I think combination of groupid + datekey would be primary key.
And in case incremental load picks up data for multiple days you need to ensure it generates a separate groupid for each date.
Currently how is groupid generated? does it come from source or is it generated within ETL?
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

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