I have data like following

WO createdate grp1
1 20/02/2007 a
2 21/02/2007 a
3 23/02/2007 a
4 24/02/2007 a
5 25/02/2007 a
6 26/02/2007 a
7 20/02/2007 b
8 21/02/2007 b
9 23/02/2007 b
10 24/02/2007 b
11 25/02/2007 b
12 26/02/2007 b


I want to calcutale total no of records for each group between Specific Date


Like this:

20/02/2007 -23/02/2007 23/02/2007- 26-02/2007
a 3 3
b 3 3

Can Anybody help its urgent