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How do I crete a ranking for a user in a SQL Server 2000 stored procedure to rank a user based on percentage of questions correct?

Posted on 2008-11-06
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Last Modified: 2012-08-13
I am using ASP.NET vb and SQL SERVER 2000 (not 2005). I need to create a stored procedure (or part of an existing stored procedure that will do the following:

1) Rank a user (from total users that have taken the quiz) on how many answers they have gotten correct.
2) Rank the user based on their percentage of correct answers...i.e. if john doe got 9% of his answers correct. John Doe ranks # 10 of 150 total users.

Please help. I know there are ranking functions Sql server 2005, but I am using 2000. How do I go about doing rankings this way using SQL Server 2000.

Once I have the rankings, I have to output to a page.
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Question by:bolenka
11 Comments
 
LVL 16

Assisted Solution

by:brad2575
brad2575 earned 100 total points
ID: 22894802
dont have the syntax, but if you just calculate the formula for the percent they received, then order by the percent, you will have the order they need to be in.

then use something like this link to create the row number (with the order by will give you the rank)

http://databases.aspfaq.com/database/how-do-i-return-row-numbers-with-my-query.html
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LVL 25

Expert Comment

by:SStory
ID: 22894994
We would need to see db structure to give you code.

I assume you have a user table.  Then I assume a quiz table, probably a questions table, etc.
Assuming that quiz table are the questions to be asked, and maybe there is a quiz_taken table that represents a user having taken a quiz.  I also assume that you have a field in the quiz_taken table that tells the percent correct. If not you'd have to do another query to get the results.

SELECT u.UserName,qt.PercentCorrect
FROM USER u
INNER JOIN Quiz_Taken qt ON u.User_ID=qt.User_ID
INNER JOIN quiz q ON qt.quiz_id=q.quiz_id
ORDER BY qt.PercentCorrect,u.UserName

based on my assumptions, you'd do something like the above.
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LVL 25

Expert Comment

by:SStory
ID: 22894998
If you wanted the top percent at the top you'd of course use the DESC keyword in the order statement for qt.PercentCorrect
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Author Comment

by:bolenka
ID: 22895320
actually I only have one table. I have a userAnswers table that is created when the program is opened and then it just updates the answer when the user submits the answer. All of the questions and answers for comparison are in one table...its just what the client had available.

ID(unique) RecordID(testquestionID) UserID UserAnswer, CorrectAnswer, DateSubmitted, Correct, Completed, etc.

I just need to do the rankings based on number of correct answers for that RecordID(for that testquestion)...once I do the calculation for the ranking and other statistics,I insert them to a table called Benchmarks for display...so really, I have the percent corrects already, I just need to rank the user by percents I guess.

If I already have the percents calculated? Do I just order them? I would have to create an ID right to show what the ranking number is?

Does that help?
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LVL 20

Accepted Solution

by:
informaniac earned 300 total points
ID: 22896121
As you have mentioned you could do the following for generating the id

create a temporary table

declare @table table
(
    rank int identity(1,1),
    UserID varchar(50),
.........
)

Now insert into this @table values based on the highest percentage

So basically when u r inserting the one with highest percentage it will give u rank 1 as highest
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LVL 25

Assisted Solution

by:SStory
SStory earned 100 total points
ID: 22896157
YUCK!  that is terrible design. Oh well.

Try something like this

SELECT Distinct UserID, Count(*) as NumCorrect
WHERE UserAnswer=CorrectAnswer
ORDER BY NumCorrect,UserID

Again you may want the DESC keyword to reverse the order
0
 

Author Comment

by:bolenka
ID: 22896778
Yes I know...terrible design....but there was not much I could do about it...but thanks for your responses...I will take a look at them and get back to you. Thanks again.
0
 

Author Comment

by:bolenka
ID: 22899864
informaniac, any chance you could post the syntax?
0
 

Author Closing Comment

by:bolenka
ID: 31513887
I kind of used a little bit from all suggestions to help me, but I went with the insert to temp table...that was really helpful because I had never written to a temp table before. Thanks so much. I think my rankings are working now. you guys are awesome.
0
 
LVL 25

Expert Comment

by:SStory
ID: 22904690
Temp tables are great, but can be misused also.  This is probably a good use for them.  If you have many users who will be viewing this same information again and again, you should consider caching the information for a time to lower the db load.
0
 

Author Comment

by:bolenka
ID: 22906700
SStory: Thank you for that extra tip. I will keep that in mind.
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