Question

I am developing a training management web-based system that provides the user with short quizzes to refresh their knowledge. Anyway, I have the following database design:

Employee Table: Username, Name, DivisionCode
Divisions Table: SapCode, DivisionShortcut
Quiz Table: QuizID, Title, IsSent
Question Table: QuestionID, Question, QuizID...
UserQuiz Table: UserQuizID, QuizID, Username, Score.

I was be able to come up with a query that shows the names of all non-participants in all divisions just in the last quiz. What I want now is to show the non-participants names in all quizzes that have been sent to the users to participate in them. The results should be listed grouping by quiz title and DivisionShortcut. So how to do that?

My Query:

SELECT d.DivisionShortcut, e.Name 
FROM employee e
 join Divisions d on (e.DivisionCode = d.SapCode)
 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 e.Username = c.Username
                                 WHERE c.QuizID is null
                                 Order By d.DivisionShortcut

Answer 1

You can use CROSS JOIN to get all combinations of employee and Quiz, then use NOT EXISTS to eliminate all combinations that have been completed:

SELECT  *
FROM    Employee e
        INNER JOIN Divisions d
            ON e.DivisionCode = d.SapCode
        CROSS JOIN Quiz
WHERE   Quiz.IsSent = 1 
AND     NOT EXISTS
        (   SELECT  1
            FROM    UserQuiz uq
            WHERE   uq.QuizID = Quiz.QuizID
            AND     uq.UserName = e.UserName
        )