How to perform caculations using database functions which will count
the number of instances between two different times in the undernaoted
example.

Date Rate
2:41:08 PM 17475.59
2:40:53 PM 17471.12
2:40:28 PM 17465.72
2:40:13 PM 17448.77
2:40:03 PM 17440.78
2:39:48 PM 17437.58
2:39:38 PM 17435.87
2:39:23 PM 17431.73
2:39:13 PM 17429.6
2:38:58 PM 17425.05
2:38:43 PM 17431.12
2:38:33 PM 17434.67
2:38:18 PM 17428.22
2:38:08 PM 17427.22
2:37:28 PM 17435.77
2:37:13 PM 17439.49
2:37:03 PM 17441.45
2:36:48 PM 17440.69
2:36:33 PM 17445.43
2:36:23 PM 17449.32
2:36:08 PM 17469.25
2:35:43 PM 17483.85
2:35:28 PM 17487.99
2:35:18 PM 17488.58
2:35:03 PM 17504.72
2:34:48 PM 17513.39
2:34:38 PM 17519.69
2:34:23 PM 17528.89
2:33:58 PM 17532.92
In this example I would like to count the number of rates ,maximum
rate and minimum rate say between 2.33 pm and 2.38 pm

Thanks in adavance