Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

SQL query on SQL server 2005

Posted on 2009-07-02
4
Medium Priority
?
207 Views
Last Modified: 2012-05-07
I have to query the database to find the peak 5 mins in a day, where highest number of users are logged in . I have userID and date on the same table.
0
Comment
Question by:Govinda2020
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 43

Expert Comment

by:pcelba
ID: 24761985
Hope you have UserID and DateTIME. Do you also have the action on that time? Hopefully yes.

Then you should clarify if you would like to split each hour to 12 parts with given beginning and end time OR if you really need to select the highest 5 minutes daily peak without given fixed time fragments. Another question is how to count same user logged-in on more computers.
0
 

Author Comment

by:Govinda2020
ID: 24762969
Thanks for getting back, Yeah we have action = logged in, we can assume that there is only one user logged-in .Yeah its better to split each hour to 12 parts with given beginning and end time.
0
 
LVL 43

Accepted Solution

by:
pcelba earned 2000 total points
ID: 24767545
If you have just one action (logged in) then you are not able to count logged in users because you don't know who is logged already out... In such case the maximum is always the last 5 minutes :-). But you can use your data to count the 5 minutes peak of login operation itself which is different from number of logged in users.

It would be better if you disclose your data... or their structure at least.

The following example selects the 5 minutes peak of login operations from my table (it does not split hour to 12 portions):

;WITH CTE (RowNo, DateTime, cnt) AS
(
SELECT a.RowNo, a.Timestamp, COUNT(b.UserId) cnt
  FROM (SELECT ROW_NUMBER() OVER(ORDER BY Timestamp) RowNo, UserId, Timestamp FROM tt) a
 INNER JOIN (SELECT ROW_NUMBER() OVER(ORDER BY Timestamp) RowNo, UserId, Timestamp FROM tt) b
    ON b.RowNo >= a.RowNo AND b.Timestamp <= DATEADD(minute, 5, a.Timestamp)
 group by a.RowNo, a.Timestamp
)
SELECT DateTime, cnt
  FROM CTE
 WHERE cnt = (SELECT MAX(cnt) FROM CTE)

Open in new window

0
 

Author Closing Comment

by:Govinda2020
ID: 31599102
Thanks a lot....That was perfect answer.....
0

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Recently, when I was asked to create a new SQL 2005 cluster, Microsoft released a new service pack for MS SQL 2005 what is Service Pack 3. When I finished the installation of MS SQL 2005 I found myself troubled why the installation of SP3 failed …
In this article I will describe the Backup & Restore method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …

721 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question