Question

I am developing an intranet web application that provides the users with short quizzes. The quizzes will be sent to the users via emails. I have the following database design:

Employee Table: Username, Name, Job, DivisionID

Division Table: DivisionID, DivisionName

Quiz Table: QuizID, Title, Description, IsSent

UserQuiz Table: UserQuizID, Score, DateTimeComplete, QuizID, Username

NOTE: The first attribute in each table is the primary key.

And for your information, IsSent is a flag used to determine which quiz is sent to the users and which one is not.

What I want and need now is: I need to come up with a query that shows the names of the non-participants in the last sending quiz. It means if there is more than one quiz that is sent to the users, this query should display the names of non-participants in the last sending quiz. The query also should display the DivisionName, too.

I came up with the following query but it shows the non-participants in all quizzes in the database. So how to modify it? or how to get what is required above?

SELECT     TOP (100) PERCENT Q.Title, D.DivisionShortcut, E.Name
FROM         dbo.Quiz AS Q CROSS JOIN
                      dbo.employee AS E LEFT OUTER JOIN
                      dbo.Divisions AS D ON E.DivisionCode = D.SapCode
WHERE     (NOT EXISTS
                          (SELECT     UserQuizID, QuizID, DateTimeComplete, Score, Username
                            FROM          dbo.UserQuiz AS UQ
                            WHERE      (Username = E.Username) AND (QuizID = Q.QuizID)))
ORDER BY Q.Title, D.DivisionShortcut

Answer 1

Last quiz sent is

select max(quizID) from dbo.Quiz where IsSent = 1

users that participated at last quiz:

select A.QuizID, a.Username 
from UserQuiz a join 
 (select max(quizID) quizID from dbo.Quiz where IsSent = 1) b
  on a.QuizId = b.quizID

users that did not participate at the last quiz

select u.name, d.DivisionName
from
  users u
  join Divisions d on (u.divisionID = d.divisionID)
  left join 
    (select A.QuizID, a.Username 
     from UserQuiz a join 
     (select max(quizID) quizID from dbo.Quiz where IsSent = 1) b
     on a.QuizId = b.quizID
     ) c
   on u.username = c.username
 where c.QuizID is null