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T-Sql Query Logic

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Please see the sample table with some data below:

Declare @tmp table (ID int identity(1,1) not null,Name Varchar(5),
StartDate Datetime, EndDate Datetime)

Insert into @tmp 
Select 'A', '2012-11-01','2012-11-15'
Union
Select'A', '2012-11-18','2012-11-30'
Union
Select'A', '2012-12-05','2012-12-07'
Union
Select'B', '2012-11-21','2012-11-25'
Union
Select'B', '2012-11-27','2012-11-30'
Union
Select'C', '2012-11-27','2012-11-30'

Select * from @tmp

Based on that data i want some new information as shown in table below how can i achieve this

ID Name StartDate EndDate NewStartDate NewEndDate
1 A 2012-11-01   00:00:00.000 2012-11-15   00:00:00.000 2012-11-01   00:00:00.000 2012-11-17   00:00:00.000
2 A 2012-11-18   00:00:00.000 2012-11-30   00:00:00.000 2012-11-18   00:00:00.000 2012-12-04   00:00:00.000
3 A 2012-12-05   00:00:00.000 2012-12-07   00:00:00.000 2012-12-05   00:00:00.000 2012-12-9   00:00:00.000
4 B 2012-11-21   00:00:00.000 2012-11-25   00:00:00.000 2012-11-21   00:00:00.000 2012-11-26   00:00:00.000
5 B 2012-11-27   00:00:00.000 2012-11-30   00:00:00.000 2012-11-27   00:00:00.000 2012-12-9   00:00:00.000
6 C 2012-11-27   00:00:00.000 2012-11-30   00:00:00.000 2012-11-27   00:00:00.000 2012-12-9   00:00:00.000


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