Counting Number of Occurrences in Date Range

Posted on 2007-03-27
Medium Priority
Last Modified: 2012-06-27
Sql Server 2005
Is there a straightforward way to calculate the number of occurrences in a given date range? Ex.
I have a Vehicle table V joined with VehicleRepairOrder table RO on V.VehicleId  = RO.VehicleId.

It's a one-to-many relationship and I need to find the number of vehicles with 3 or more repair orders in any given year (RO.DateOfRO is the field I'm trying to make the date calculations from)

Any input or suggestions would be appreciated.
Question by:ViceroyFizzlebottom
  • 3
  • 2
LVL 32

Expert Comment

by:Daniel Wilson
ID: 18801483
Select V.VehicleID, count(RO.DateOfRO) as NumRepairs
From Vehicle V Inner Join VehicleRepairOrder RO on V.VehicleId  = RO.VehicleId
Where DateOfRO Between '1/1/2006' and '12/31/2006'
Group by V.VehicleID
LVL 32

Expert Comment

by:Daniel Wilson
ID: 18801501
Above solution gives you the count for each vehicle.

to limit it to those w/ 3+ repairs, add:

HAVING count(RO.DateOfRO) >=3

Author Comment

ID: 18801790
Thanks for the quick response first of all.
The solution you gave is in fact what I am using, but to clarify a bit; that solution gives the number of vehicles if the date range is explicitly given. I am more interested in something that for the entire history of vehicle repairs (in this case is 1999-Present).
The method I was (am) using and what you listed above gives the vehicles for that year, but if the same vehicle was also in 3 or more times in 2005 and I run the query for 2005, that vehicle will essentially be counted twice.

Sorry if that doesn't help explain my issue a little better.

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

LVL 32

Accepted Solution

Daniel Wilson earned 1000 total points
ID: 18801867
OK ... how about this?

Select distinct VehicleID From
(Select V.VehicleID, Year(RO.DateOfRO) as RepYear, count(RO.DateOfRO) as NumRepairs
From Vehicle V Inner Join VehicleRepairOrder RO on V.VehicleId  = RO.VehicleId
Group by V.VehicleID, Year(RO.DateOfRO)
HAVING count(RO.DateOfRO) >=3) VCount

Author Comment

ID: 18802190
Ah beautiful. It's funny how simple and straightforward things are when someone shows you how to do it :)

Great job, I appreciate it DanielWilson

Expert Comment

ID: 25663767

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

by Mark Wills Attending one of Rob Farley's seminars the other day, I heard the phrase "The Accidental DBA" and fell in love with it. It got me thinking about the plight of the newcomer to SQL Server...  So if you are the accidental DBA, or, simp…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…
Stellar Phoenix SQL Database Repair software easily fixes the suspect mode issue of SQL Server database. It is a simple process to bring the database from suspect mode to normal mode. Check out the video and fix the SQL database suspect mode problem.

607 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