How to Group discontinued time periods

Question

Hi All:
I have an issue which costs me bunch of time to develop. Basically I am trying to use discounted time in a select query but feel  like get nowhere to start.
the scenarios is like this:
I have many rows of data of this and I would like to have a solution I can select time period from just like what I can do for integer and text:
Select *
From Table
Where Group = B
and Open_Date in (select the all group A's time interval)
to explain this problem in plain text, I would like to select all records from Group B whose Open_Date is within the interval between Group A's Open_Date and Close_Date. Thanks all in advance.
Record
Open_Date
Close_Date
GROUP
1
9/12/2013 9:25
9/12/2013 10:44
A
2
9/12/2013 10:19
9/12/2013 10:39
A
3
9/12/2013 10:22
9/12/2013 10:22
A
4
9/12/2013 10:56
9/12/2013 12:41
B
5
9/12/2013 12:00
9/12/2013 12:00
B
6
9/12/2013 12:00
9/12/2013 12:01
A
7
A+E301:H318
9/12/2013 12:03
A
8
9/12/2013 13:44
9/12/2013 13:46
C
9
9/12/2013 13:46
9/12/2013 13:46
C
10
9/12/2013 13:46
9/12/2013 14:33
C
11
9/12/2013 14:04
9/12/2013 14:09
A
12
9/12/2013 14:23
9/12/2013 17:05
A
13
9/12/2013 15:54
9/12/2013 15:54
A
14
9/12/2013 15:54
9/12/2013 15:55
B
15
9/12/2013 15:55
9/12/2013 15:55
B
16
9/12/2013 15:55
9/12/2013 15:58
A
17
9/12/2013 16:02
9/12/2013 16:02
A

Answer 1

Sorry cannot test it right now
Select *
From Table
Where Group = B
AND Open_Date in (SELECT OpenDate FROM Table WHERE  Group = A
AND  OpenDate  BETWEEN OpenDate  AND CloseDate )
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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