Math - Division Question..

To set the stage, Tables are set up as such for this question:
-----------

Table: Answers
ID - Integer - Auto
Answer - Integer
QuestionID - Integer - FK from the QuizMaster table
StudentID - Integer - FK from the Students table

Table: QuizMaster

ID - Integer - Auto
Answer - Integer

Table: Students
ID - Integer - Auto
StudentName - Varchar(50)
----------
I would like to have an either a sql statement (1st) or a stored procedure (2nd) that would give me the percent correct for each student on the test.

In Access I could cheat and use this:



Code BlockSELECT Students.StudentName,
Count(Students.StudentName) AS TotalCorrect,
(SELECT Count(QuizMaster.ID) FROM QuizMaster;) AS TotalQuestions,
([TotalCorrect])/([TotalQuestions])*100 AS PercentValue
FROM (Answers INNER JOIN Students

ON Answers.StudentID = Students.ID)
INNER JOIN QuizMaster
ON (Answers.Answer = QuizMaster.Answer)
AND (Answers.QuestionID = QuizMaster.ID)
GROUP BY Students.StudentName
ORDER BY Students.StudentName, PercentValue;

Which is composed of the following...







Code Block

SELECT Students.StudentName,


Count(Students.StudentName) AS TotalCorrect
FROM (Answers INNER JOIN Students

ON Answers.StudentID = Students.ID)
INNER JOIN QuizMaster
ON (Answers.Answer = QuizMaster.Answer)
AND (Answers.QuestionID = QuizMaster.ID)


GROUP BY Students.StudentName;


SELECT Count(QuizMaster.ID) AS TotalQuestions
FROM QuizMaster;


([TotalCorrect])/([TotalQuestions])*100 AS PercentValue


But... that wont fly in SQL Server...What would work without using temp tables?
What would be the EASIEST way to do this?

Another way someone suggested is:




Code BlockCREATE PROCEDURE GetStudentGradeByID @StudentID Integer

AS

BEGIN


DECLARE @TotalQuestionsAsked as Integer;
DECLARE @StudentName as VarChar(50);
DECLARE @QuestionsCorrect as Integer;
DECLARE @PercentCorrect as Float;

set @TotalQuestionsAsked = select COUNT(*)FROM QuizMaster;
set @StudentName = select StudentName from Students where ID = @StudentID;

set @QuestionsCorrect = select count(Answers.ID) from Answers LEFT JOIN QuizMaster on Answers.QuestionID = QuizMaster.ID where StudentID = @StudentID AND QuizMaster.Answer = Answers.Answer;
set @PercentCorrect = (CAST (@QuestionsCorrect AS FLOAT) / CAST (@TotalQuestionsAsked AS FLOAT)) * 100.0;

select @QuestionsCorrect as TotalCorrect, @StudentName as Student, @TotalQuestionsAsked as NumQuestions, @PercentCorrect as CorrectPct;

END


But I need this as a datasource for a datagrid that would show all students etc... so using a parameter isn't really what I want.
So... could a stored procedure work for this?