?
Solved

TSQL join, sum, count

Posted on 2013-01-25
2
Medium Priority
?
446 Views
Last Modified: 2013-01-25
I have a sql statement that I'm using and am trying to add one additional column that counts GuestRegID from table Guest, joined by StudentID.  The problem is that when I add it, the SUM(CPSTransaction.AuthorizationAmount) doubles the value when there is more than 1 guest record.

This add's the sum correctly.
Select Registration.RegistrationID2, Registration.FirstName, Registration.LastName, SUM(CPSTransaction.AuthorizationAmount) as TotalAmountPaid
FROM Registration LEFT JOIN CPSTransaction ON Registration.STUDENTID = ApplicationIDPrimary 
WHERE Registration.IsActive = 'True' AND (CommunicationPreference = 'Email') AND (CommsSent='0') 
GROUP BY Registration.RegistrationID2, Registration.FirstName, Registration.LastName

Open in new window


When I add the join and COUNT(Guest.GuestRegID) AS Guests it doubles the value.
Select Registration.RegistrationID2, Registration.FirstName, Registration.LastName, SUM(CPSTransaction.AuthorizationAmount) as TotalAmountPaid, COUNT(Guest.GuestRegID) AS Guests
FROM Registration LEFT JOIN CPSTransaction ON Registration.STUDENTID = ApplicationIDPrimary LEFT JOIN Guest ON CPSTransaction.ApplicationIDPrimary = Guest.StudentID
WHERE Registration.IsActive = 'True' AND (CommunicationPreference = 'Email') AND (CommsSent='0') 
GROUP BY Registration.RegistrationID2, Registration.FirstName, Registration.LastName

Open in new window


For each Registration.RegistrationID2, I only want to show once, and want to show the count of the GuestRegID from the Guest table joined by Student ID.
I've tried several different scenarios but am needing some help.  What am I missing?
Thank you.
0
Comment
Question by:javierpdx
[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 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 38819853
you have to first group for the first join, then group/join for the second table,...
select sq.RegistrationID2, sq.FirstName, sq.LastName
, COUNT(g.GuestRegID) AS Guests
FROM (  
          Select r.RegistrationID2, r.FirstName, r.LastName,  r.STUDENTID
              , SUM(t.AuthorizationAmount) as TotalAmountPaid  
           FROM Registration r
            LEFT JOIN CPSTransaction t ON r.STUDENTID = t.ApplicationIDPrimary 
          WHERE r.IsActive = 'True' 
             AND r.CommunicationPreference = 'Email'
             AND r.CommsSent='0' 
   GROUP BY  r.RegistrationID2, r.FirstName, r.LastName, r.STUDENTID
 ) sq
LEFT JOIN Guest g
   ON sq.StudentID = g.StudentIDAND 
GROUP BY sq.RegistrationID2, sq.FirstName, sq.LastName

Open in new window


see this article about using aliases:
http://www.experts-exchange.com/Database/Miscellaneous/A_11135-Why-should-I-use-aliases-in-my-queries.html
0
 

Author Closing Comment

by:javierpdx
ID: 38820880
Thank you very much!
It worked great!

The link you provided did not work for me, but I will look for the article.
0

Featured Post

Quick Start: DOCKER

Sometimes you just need a Quick Start on a topic in order to begin using it.. this is just what you need to know to get up and running with Docker!

Question has a verified solution.

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

Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
This post looks at MongoDB and MySQL, and covers high-level MongoDB strengths, weaknesses, features, and uses from the perspective of an SQL user.
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Suggested Courses

765 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