Question

How can i counting and grouping every 2 hours ?

i have a table like this:

Id  TheTime
--  -------
1   07/07/2012 08:49:02
2   07/07/2012 09:36:39
3   07/07/2012 10:36:39
4   07/07/2012 12:36:39
5   07/07/2012 13:36:39

how can i convert into :

TheTime_08_10  TheTime_10_12  TheTime_12_14 etc.. until TheTime_22_00
-------------  -------------  ------------              -------------
       2              1            2

Thanks you in advance,
Stev

Answer 1

For a database which supports Hour() function, you can use:

SELECT Floor(Hour(TheTime)/2)*2, COUNT(*) FROM TimeTable GROUP BY Floor(Hour(TheTime)/2)

You will get something like this:

Floor(...) | Count(*)
---------------------
8          | 1
10         | 3
12         | 5
16         | 1

The first column is the starting hour – 8 means time from 8:00 to 9:59, etc.