SQL Server Forums
Profile | Register | Active Topics | Members | Search | Forum FAQ
 
Register Now and get your question answered!
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 General SQL Server Forums
 New to SQL Server Programming
 How to calculate average number of days taken
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

Maverick_
Posting Yak Master

107 Posts

Posted - 01/16/2014 :  07:15:19  Show Profile  Reply with Quote
Hi guys,

I am trying to figure out how to calculate the overall average number of days taken to complete something.

The two fields are enquiry_date (date enquiry is recorded) and complete_date (date enquiry completed/closed).

Each enquiry has a enquiry_number

Sample data typically looks like:

Enquiry number - enquiry_time - complete date
1 - 01/01/2014 - 12/01/2014
2 - 01/01/2014 - 11/01/2014
3 - 01/01/2014 - 10/01/2014
4 - 01/01/2014 - 07/01/2014
5 - 01/01/2014 - 12/01/2014
6 - 01/01/2014 - 04/01/2014

etc.

What is the piece of SQL which looks at the average date difference for each enquiry and then sums it all up to give an overall average number of days it takes?

I am a bit stuck!

visakh16
Very Important crosS Applying yaK Herder

India
52317 Posts

Posted - 01/16/2014 :  07:17:58  Show Profile  Reply with Quote

SELECT SUM(DATEDIFF(dd,enquiry_time,[complete date]))*1.0/NULLIF(COUNT([Enquiry number]),0) AS AverageEnquiryTime
FROM Table


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
https://www.facebook.com/VmBlogs
Go to Top of Page

Maverick_
Posting Yak Master

107 Posts

Posted - 01/16/2014 :  10:00:41  Show Profile  Reply with Quote
Thanks Visakh!
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
SQL Server Forums © 2000-2009 SQLTeam Publishing, LLC Go To Top Of Page
This page was generated in 0.08 seconds. Powered By: Snitz Forums 2000