SQL consecutive occurrences count

SQL consecutive occurrences count

I want to display the count of a criteria based on its occurrence for a
time period and its below time periods.
Let's say this is the table layout
Key1 | Key2 | Key3 | emailSent_Date |
08/01/2013| 0097A | 0097A | 07/01/2013 |
07/01/2013| 0097A | 0097A | 08/01/2013 |
06/01/2013| 0097A | 0097A | 08/01/2013 |
Desired output : SQL query to get the count of key2 and key3 occurrences
for a time period and its below timperiods. The count has to be
consecutive.
Here, for august month key2 and key3 occurred for 3 times. But, for the
july month, key2 and key3 occurred for two times only. Sorry if I made it
complex.
Key1 | Key2 | Key3 | emailSent_Date | Count |
08/01/2013| 0097A | 0097A | 07/01/2013 | 3 |
07/01/2013| 0097A | 0097A | 08/01/2013 | 2 |
06/01/2013| 0097A | 0097A | 08/01/2013 | 1 |