SQL Server Query LEFT JOIN, SUM and GROUP BY and I'm stumped!

Question

I am beating my brain against this one

I have 3 SQL Server 2005 tables

userawards:

id, awardamount, userid, dateawarded, aw         


        

Answer 1

You probably want

SELECT userid, 
       awardtypeid, 
       SUM(awardamount) 
FROM   awards a 
       LEFT JOIN userinfo ui 
         ON ui.userid = a.userid 
       LEFT JOIN awardtypes 
         ON awardtypesid = a.awardtypeid 
GROUP  BY userid, 
          awardtypeid 

or

SELECT userid, 
       SUM(awardamount) 
FROM   awards a 
       LEFT JOIN userinfo ui 
         ON ui.userid = a.userid 
       LEFT JOIN awardtypes 
         ON awardtypesid = a.awardtypeid 
GROUP  BY userid

This drops the id Column (probably not what you want to group on)

In the first case I included the awardtypeid in the select but this means you must also add that to the group by.