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Help with Sql Query

Posted on 2013-06-13
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Last Modified: 2013-06-14
Hi Experts,

I have below query(output of it attached in quiz1.jpg)
 Select Qid as Queid,QText as Question,        
 OptionA,OptionB,OptionC,OptionD,QAns as Answer        
 from examQB eq inner join Exam e      
 on eq.examid = e.examid       
where e.ExamId = @ExamId  and eq.isDeleted = 0 and e.isdeleted = 0       
 order by newid() 

Open in new window


I need to change this query to display output as quizquery.bmp
The optionA/B/C/D column should come in rows under one column.

Your help is really appreciated.
Thanks
quiz1.JPG
quizquery.bmp
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Comment
Question by:johny_bravo1
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10 Comments
 
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Expert Comment

by:PortletPaul
Comment Utility
>>The optionA/B/C/D column should come in rows under one column.
With what technology are you actually displaying the questions? (e.g. PHP, C#, java)

Arranging a question like this:

Q1: This is the question
Opt1: blah
Opt: 2 der
Opt: 3 eh?
Opt: 4 nuh!
Opt: 5 all the above
Answer = [       ]        

this is better handled in a "presentation layer" not sql.
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Author Comment

by:johny_bravo1
Comment Utility
Hi PortletPaul,

I am using C#. Can you tell how to do this in C#.

Arrangement is not an issue. I am binding this to gridview. This works.
But I need the output( I don't mind if it is done in C#) as given in fig 2.
Then the dataset should like it.

I thought it might be easier to get the formatted output from sql .
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Expert Comment

by:PortletPaul
Comment Utility
I would advise to allow sql to provide the data in separate columns - massaging into a single columns isn't a great thing to do. (i.e. yes it can be done - but I advise not to)

I cannot do your C# stuff - but that is certainly where you do the "arrangement"
(! including the transposition of columns to rows)
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Expert Comment

by:vinurajr
Comment Utility
I think u can make use of PIVOT in sql server
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Expert Comment

by:PortletPaul
Comment Utility
as I said - it can be done - but should it? SQL natively (see quiz1.JPG) will present the question and each option as separate columns - when the data is received by C# it must be massaged into a format for consumption by the end-user. That massaging should also do the transposition. into whatever layout is required.

I'll stop now - if others wish to provide the data in a single column - please go ahead - I just think its a bad idea (i.e. let sql do its thing & let C# do its thing).
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Expert Comment

by:vivekkumarSharma
Comment Utility
if OBJECT_ID('a') is not null
drop table a
go
create table a 
(
Qid int,
QText varchar(20)
,OptionA varchar(20)
,Optionb varchar(20)
,Optionc varchar(20)
,Optiond varchar(20)
,QAns varchar(20)
)

declare @count int=1
while @count <=20
begin
insert into a
select @count,'text'+ltrim(STR(@count)),'A'+ltrim(STR(@count)),'B'+ltrim(STR(@count)),'C'+ltrim(STR(@count)),'D'+ltrim(STR(@count)),'ans'+ltrim(STR(@count))

set @count+=1
end


--- origional text
 Select Qid as Queid,QText as Question,        
 OptionA,OptionB,OptionC,OptionD,QAns as Answer        
 from a
 
 
 
 --- Excepted format
 Select Qid as Queid,QText as Question,        
 options,QAns as Answer 
 from a
 unpivot ( value for options in (OptionA,OptionB,OptionC,OptionD) )pvt

Open in new window

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Accepted Solution

by:
Bhavesh Shah earned 500 total points
Comment Utility
hi,

I don't know in C#, but see this query, if it fits to your criteria.

 Select Qid as Queid,QText as Question,        
 OptionA 'Option',QAns as Answer        
 from examQB eq inner join Exam e      
 on eq.examid = e.examid       
where e.ExamId = @ExamId  and eq.isDeleted = 0 and e.isdeleted = 0       
union
Select Qid as Queid,QText as Question,        
 OptionB,QAns as Answer        
 from examQB eq inner join Exam e      
 on eq.examid = e.examid       
where e.ExamId = @ExamId  and eq.isDeleted = 0 and e.isdeleted = 0       
union
Select Qid as Queid,QText as Question,        
 OptionC,QAns as Answer        
 from examQB eq inner join Exam e      
 on eq.examid = e.examid       
where e.ExamId = @ExamId  and eq.isDeleted = 0 and e.isdeleted = 0       
union
Select Qid as Queid,QText as Question,        
 OptionD,QAns as Answer        
 from examQB eq inner join Exam e      
 on eq.examid = e.examid       
where e.ExamId = @ExamId  and eq.isDeleted = 0 and e.isdeleted = 0       
 order by newid() 

Open in new window

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Expert Comment

by:vivekkumarSharma
Comment Utility
I Agree with PortletPaul that its a bad idea to do such tasks with SQL.
C# is best way to handle such situations.

I don't know much in ASP.Net, but I think Repeater can manage them in wanted format.
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LVL 48

Expert Comment

by:PortletPaul
Comment Utility
http://www.codeproject.com/Articles/44274/Transpose-a-DataTable-using-C
Transpose a DataTable using C#

the right way in C# (example above)

:( still think this is a very bad idea (below)
the following may work for the 'unpivot' and should perform better than multiple unions  (and yes even against the unpivot - but on such a small scale it probably won't be noticeable)
SELECT
      Qid AS Queid
    , CA.seq
    , CA.detail
FROM examQB eq
INNER JOIN Exam e ON eq.examid = e.examid AND e.isdeleted = 0
CROSS APPLY (
      VALUES
              ('A', QText)
            , ('B', OptionA)
            , ('C', OptionB)
            , ('D', OptionC)
            , ('E', OptionD)
            , ('F', QAns)
            ) as CA (seq, detail)
WHERE eq.ExamId = @ExamId
AND eq.isDeleted = 0

Open in new window

however I expect the output will look like this:
QID SEQ DETAIL
111 A      To be or not to be, that is the question.
111 B       to be
111 C       not to be
111 D      both
111 E       neither
111 F       to be
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LVL 8

Author Comment

by:johny_bravo1
Comment Utility
Thank you all the experts for taking time to look into the issue
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