Combined the continuous records into one in Crystal Report XI

Question

I need help for combining the continuous Date1 and Date2 if same ID? What formula or method I can do?
Original Data:
ID               Date1             Date2
1111111  3/16/2009      6/27/2009
1111111  8/20/2009      9/10/2009
1111111  10/14/2009   11/9/2009
1111111  11/9/2009     1/11/2010
1111111  1/11/2010     (blank)
1111111  1/11/2010     1/11/2010
1111111  1/11/2010     6/9/2010
1111111  8/20/2010     9/10/2010
Final Result:
ID               Date1            Date2
1111111  3/16/2009     6/27/2009
1111111  8/20/2009     9/10/2009
1111111  10/14/2009   (blank)
1111111  8/20/2010     9/10/2010
The idea is to eliminate the continuous or repeated records for the same person. The ID indicates a person, Date1 is an open date, and Date2 is a close date. If ID are same, and the date1 is equal to the previous date2, then we keep the earliest date1, which is the previous open date (date1) here and keep the latest close date (date2) if date2 is not empty.
However, empty Date2 means it is not close yet and I am going to take that rather than other Date2 if it is the continuous cases or same Date1 for these records with same ID as well.
If the open date (Date1) is after at least 3 days than the previous close date (previous Date2), we treat it as a new record and it is not continuous even though their ID are same.
I am able to compare two records at a time, but I have no idea to do it when it happens across more than 2 continuous records and not even mention to delete these records and arrange their open date and close date.
Thank you so much for your help!!

Answer 1

Hi Albert, 
We're going to need more information because what you want doesn't quite make sense.  How does
Result:
ID Date1 Date2
1111111 10/14/2009 (blank)
relate when your original data doesn't have these two dates together? 
I'm going to make some huge assumptions here so try this. 
If {table.DATE2} = Date (0, 0, 0) Then
    ToText ({table.ID}, 0, 0, "", "") & ToText (table.DATE1}, "MM/dd/yyyy")
Else ToText ({table.ID}, 0, 0, "", "") & ToText (table.DATE1}, "MM/dd/yyyy") & ToText ({table.DATE2}, "MM/dd/yyyy") ;
If Date2 is null then it build a string with just ID and Date1 otherwise build a string with all three fields. 
Now you can group on this formula to get the distinct values. 
Hope this helps,
Brian