Question

To keep things very simple, say I have a SQL Server 2008 table with a single column that has a datetime data type. I’d like a query that produces the number of rows for each minute interval. For example, the results would look like this:

7/3/2011 14:00:00 | 1000
7/3/2011 14:01:00 | 1097
7/3/2011 14:02:00 |  569

The first row would mean that 1000 rows have a datetime value between 7/3/2011 13:59:00 and 7/3/2011 14:00:00.

The second row would mean that 1097 rows have a datetime value between 7/3/2011 14:00:00 and 7/3/2011 14:01:00.

The third row would mean that 569 rows have a datetime value between 7/3/2011 14:01:00 and 7/3/2011 14:02:00.

Thank you.

Answer 1

This:

;WITH CTE_ExampleData as (
    select stamp = '07/07/2011 14:00:01'
    union select stamp = '07/07/2011 14:00:02'
    union select stamp = '07/07/2011 14:00:03'
    union select stamp = '07/07/2011 14:01:01'
    union select stamp = '07/07/2011 14:01:02'
    union select stamp = '07/07/2011 14:01:03'
    union select stamp = '07/07/2011 14:01:04'
    union select stamp = '07/07/2011 14:02:02'
    union select stamp = '07/07/2011 14:02:03'
    union select stamp = '07/07/2011 14:02:04'
    union select stamp = '07/07/2011 14:02:05'
)
 select 
    stamp = dateadd(mi,datediff(mi,0,stamp) + 1,0),
    rows = count(1)
 from CTE_ExampleData
 group by dateadd(minute,datediff(mi,0,stamp)+1,0)

Returns

stamp                       rows
2011-07-07 14:01:00.000     3
2011-07-07 14:02:00.000     4
2011-07-07 14:03:00.000     4