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Count time of day at which records are created SQL

Posted on 2011-03-16
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Last Modified: 2012-05-11
I have a table where records are made throughout the day and night. I want to construct a query that will  return on average how many records are made at each hour.

How could I do this?

I have got as far as extracting the hour from the datetime field. But when I try and add a count/group the query breaks.

 select
      DATEPART(hour,DateTime) as 'Hour' from [mytable]
0
Comment
Question by:nhmedia
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5 Comments
 
LVL 53

Accepted Solution

by:
Dhaest earned 500 total points
ID: 35145177
Did you try

select
      DATEPART(hour,DateTime) as 'Hour' , count(*)
from [mytable]
group by DATEPART(hour,DateTime)
0
 
LVL 5

Expert Comment

by:mayankagarwal
ID: 35145970
If you want the average the query can be:

select avg(select count(*)
from [mytable]
group by DATEPART(hour,DateTime)) from dual
0
 
LVL 10

Expert Comment

by:John Claes
ID: 35146004
The following is my suggestion

1) You need to Count the occurenced by Day and Hour
2) those Counts by the Hour schould then be used in your Average calculation



select Hour, AVG(HourSumming) as HourAverage
from
(
      select
            convert(nvarchar(10), date) as 'DATE' ,
            DATEPART(hour,date) as 'Hour' ,
            count(*) as HourSumming
      from  [mytable]
      group by       convert(nvarchar(10), date),
            DATEPART(hour,date)
) as CountedByHourAndDate
group by Hour

regards
poor beggar
0
 

Author Comment

by:nhmedia
ID: 35171231
Thanks very much for the suggestions...

I got the first solution to work! I was also interested in the average idea, but the second solution produced an error: avg function requires one argument.  

0
 

Author Closing Comment

by:nhmedia
ID: 35184272
Very helpful, worked straight away
0

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