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razeena
Yak Posting Veteran

54 Posts

Posted - 2013-04-18 : 05:00:13

Hi,
I have three tables related to Question Papers. The objective is to find out how many users attended these papers. Each question paper may contain different sections. Even if a person attended atleast one
section, the paper is considered as attended. Please see the sample
table and expected output.
=================================
tbl_Question
***********
QID title description
100 History History
101 Maths Maths
102 Hindi Hindi

tbl_QuestionSection
**********************
SectionID QID SectionName
1 100 IndianHistory
2 100 WorldHistory
3 100 StateHistory
4 101 Statistics
5 101 Probability
6 102 General
7 102 Descriptive

tbl_UserSection
*****************
UserSecID UserID QpSecID
1 500 2
2 500 3
3 501 1
4 502 1
5 503 5

==================================
Expected result
-----------------------------
QuestionPaper NoofAttendees
History 3
Maths 1
Hindi 0
-------------------------------

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-04-18 : 05:14:38

[code]
SELECT q.title,
COUNT(DISTINCT UserID) AS NoOfAttendees
FROM tbl_Question q
LEFT JOIN tbl_QuestionSection qs
ON qs.QID = q.QID
LEFT JOIN tbl_UserSection us
ON us.QpSecID = qs.SectionID
GROUP BY q.title
[/code]

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
https://www.facebook.com/VmBlogs

razeena
Yak Posting Veteran

54 Posts

Posted - 2013-04-22 : 01:56:23

Perfect! It worked.Thank you.

quote:
Originally posted by visakh16

SELECT q.title,
COUNT(DISTINCT UserID) AS NoOfAttendees
FROM tbl_Question q
LEFT JOIN tbl_QuestionSection qs
ON qs.QID = q.QID
LEFT JOIN tbl_UserSection us
ON us.QpSecID = qs.SectionID
GROUP BY q.title

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
https://www.facebook.com/VmBlogs

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-04-22 : 04:28:12

welcome

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
https://www.facebook.com/VmBlogs

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