April 25, 2005 at 11:55 am
I am hitting the proverbial "wall"...and so I hope that someone can assist me:
I have a table with 25 columns ( one for each question in a test). I need to create a view that will show the COUNT of wrong answers for each question.
It would look something like this:
Q1 | Q2 | Q3
10 | 5 | 2
I can not seem to figure out how to write the select statement for this???
Any ideas are welcome.
April 25, 2005 at 12:13 pm
We well need to see the DDL of the tables to answer this one...
I would normally have a questions table with an answers table. So a simple inner join with a count(*) would be very easy to do but you'd get a record per question and not a record per exam/test.
Can you post the table def with some sample data so we can provide a solution?
April 25, 2005 at 12:18 pm
I am a bit ignorant here...but what is the table def that you need??
Are you referring to the column names and some sample data?
Sorry..
April 25, 2005 at 12:26 pm
Yes.
April 25, 2005 at 12:26 pm
I would not mind having a breakdown of incorrect answers by question , as you stated in the last reply...
You stated that this would involve the questions table with the answers table...
I would like to hear how I can accomplish this....I know you need some more info from me...so whatever I can give...I will do...
Thank you.
April 25, 2005 at 12:35 pm
Ok here is my fields:
TEST_DATE QUESTION1 QUESTION1_SCORE QUESTION2 QUESTION2_SCORE
4/25/05 B 1 A 0
4/25/05 A 0 C 1
4/25/05 C 0 D 0
As I said there are 25 questions with a score field for each one...this was done for other purposes...
I thought that I would be able to use the QuestionScore field to do the comparison...as you can see from the sample above...a 1 is for a correct score and 0 is an incorrect score..
The reason I suggested this method was that there are 2 questions within the test that have multiple answers..so I was going to write the statement so that if the score was a 0 or 1 or 2, then it would be incorrect, ortherwise it would be correct.
I may be rambling here...but if you can offer assistance as to how I can accomplish this...I would be greatly appreciative!
April 25, 2005 at 12:37 pm
I apologize..for the sample data...it did not look like that when I placed it in the reply...
Let me know if you need more clarification.
Thank you
April 25, 2005 at 12:43 pm
I know.. multiple whitespaces are ignored by the browser..
this query can solve part of your problem :
SELECT
TEST_DATE
, SUM(CASE WHEN QUESTION1_SCORE = 0 THEN 1 ELSE 0 END) AS Q1
, SUM(CASE WHEN QUESTION2_SCORE = 0 THEN 1 ELSE 0 END) AS Q2
, SUM(CASE WHEN QUESTION3_SCORE = 0 THEN 1 ELSE 0 END) AS Q3
, SUM(CASE WHEN QUESTION4_SCORE = 0 THEN 1 ELSE 0 END) AS Q4
, SUM(CASE WHEN QUESTION5_SCORE = 0 THEN 1 ELSE 0 END) AS Q5
, SUM(CASE WHEN QUESTION6_SCORE = 0 THEN 1 ELSE 0 END) AS Q6
, SUM(CASE WHEN QUESTION7_SCORE = 0 THEN 1 ELSE 0 END) AS Q7
, SUM(CASE WHEN QUESTION8_SCORE = 0 THEN 1 ELSE 0 END) AS Q8
, SUM(CASE WHEN QUESTION9_SCORE = 0 THEN 1 ELSE 0 END) AS Q9
, SUM(CASE WHEN QUESTION10_SCORE = 0 THEN 1 ELSE 0 END) AS Q10
, SUM(CASE WHEN QUESTION11_SCORE = 0 THEN 1 ELSE 0 END) AS Q11
, SUM(CASE WHEN QUESTION12_SCORE = 0 THEN 1 ELSE 0 END) AS Q12
, SUM(CASE WHEN QUESTION13_SCORE = 0 THEN 1 ELSE 0 END) AS Q13
, SUM(CASE WHEN QUESTION14_SCORE = 0 THEN 1 ELSE 0 END) AS Q14
, SUM(CASE WHEN QUESTION15_SCORE = 0 THEN 1 ELSE 0 END) AS Q15
, SUM(CASE WHEN QUESTION16_SCORE = 0 THEN 1 ELSE 0 END) AS Q16
, SUM(CASE WHEN QUESTION17_SCORE = 0 THEN 1 ELSE 0 END) AS Q17
, SUM(CASE WHEN QUESTION18_SCORE = 0 THEN 1 ELSE 0 END) AS Q18
, SUM(CASE WHEN QUESTION19_SCORE = 0 THEN 1 ELSE 0 END) AS Q19
, SUM(CASE WHEN QUESTION20_SCORE = 0 THEN 1 ELSE 0 END) AS Q20
, SUM(CASE WHEN QUESTION21_SCORE = 0 THEN 1 ELSE 0 END) AS Q21
, SUM(CASE WHEN QUESTION22_SCORE = 0 THEN 1 ELSE 0 END) AS Q22
, SUM(CASE WHEN QUESTION23_SCORE = 0 THEN 1 ELSE 0 END) AS Q23
, SUM(CASE WHEN QUESTION24_SCORE = 0 THEN 1 ELSE 0 END) AS Q24
, SUM(CASE WHEN QUESTION25_SCORE = 0 THEN 1 ELSE 0 END) AS Q25
WHERETEST_DATE = '2005/04/25'
GROUP BY TEST_DATE
You can change QUESTION16_SCORE = 0 to QUESTION16_SCORE < ?number for the right answer? for the questions with multiple answers
April 25, 2005 at 1:02 pm
OK, so I ran that statement in the Query Analyzer, and I saw the output...now it is summing up the incorrect answers by question for each test...but what I need to do ( and I probably did not state this in the beginning), is to show the total # of incorrect answers for each question during a specific date range.
EXAMPLE:
So I could show my Managers the total # of incorrect answers for the questions during the month of April
Do you know how I can tinker with this code to do that?
Thank you...
April 25, 2005 at 1:33 pm
SELECT
SUM(CASE WHEN QUESTION1_SCORE = 0 THEN 1 ELSE 0 END) AS Q1
, SUM(CASE WHEN QUESTION2_SCORE = 0 THEN 1 ELSE 0 END) AS Q2
, SUM(CASE WHEN QUESTION3_SCORE = 0 THEN 1 ELSE 0 END) AS Q3
, SUM(CASE WHEN QUESTION4_SCORE = 0 THEN 1 ELSE 0 END) AS Q4
, SUM(CASE WHEN QUESTION5_SCORE = 0 THEN 1 ELSE 0 END) AS Q5
, SUM(CASE WHEN QUESTION6_SCORE = 0 THEN 1 ELSE 0 END) AS Q6
, SUM(CASE WHEN QUESTION7_SCORE = 0 THEN 1 ELSE 0 END) AS Q7
, SUM(CASE WHEN QUESTION8_SCORE = 0 THEN 1 ELSE 0 END) AS Q8
, SUM(CASE WHEN QUESTION9_SCORE = 0 THEN 1 ELSE 0 END) AS Q9
, SUM(CASE WHEN QUESTION10_SCORE = 0 THEN 1 ELSE 0 END) AS Q10
, SUM(CASE WHEN QUESTION11_SCORE = 0 THEN 1 ELSE 0 END) AS Q11
, SUM(CASE WHEN QUESTION12_SCORE = 0 THEN 1 ELSE 0 END) AS Q12
, SUM(CASE WHEN QUESTION13_SCORE = 0 THEN 1 ELSE 0 END) AS Q13
, SUM(CASE WHEN QUESTION14_SCORE = 0 THEN 1 ELSE 0 END) AS Q14
, SUM(CASE WHEN QUESTION15_SCORE = 0 THEN 1 ELSE 0 END) AS Q15
, SUM(CASE WHEN QUESTION16_SCORE = 0 THEN 1 ELSE 0 END) AS Q16
, SUM(CASE WHEN QUESTION17_SCORE = 0 THEN 1 ELSE 0 END) AS Q17
, SUM(CASE WHEN QUESTION18_SCORE = 0 THEN 1 ELSE 0 END) AS Q18
, SUM(CASE WHEN QUESTION19_SCORE = 0 THEN 1 ELSE 0 END) AS Q19
, SUM(CASE WHEN QUESTION20_SCORE = 0 THEN 1 ELSE 0 END) AS Q20
, SUM(CASE WHEN QUESTION21_SCORE = 0 THEN 1 ELSE 0 END) AS Q21
, SUM(CASE WHEN QUESTION22_SCORE = 0 THEN 1 ELSE 0 END) AS Q22
, SUM(CASE WHEN QUESTION23_SCORE = 0 THEN 1 ELSE 0 END) AS Q23
, SUM(CASE WHEN QUESTION24_SCORE = 0 THEN 1 ELSE 0 END) AS Q24
, SUM(CASE WHEN QUESTION25_SCORE = 0 THEN 1 ELSE 0 END) AS Q25
WHERE TEST_DATE BETWEEN '2005/03/25' AND '2005/04/25'
GROUP BY TEST_DATE
April 25, 2005 at 1:46 pm
I made the adjustment for the date...but my output still summing the individual question by test...when I really need is the sum for the incorrect questions for the dates...
So I should see the sum of Q1 = 6
sum of Q2 = 2
Is this possible?
There has to be something with the way it is grouped...
April 25, 2005 at 1:58 pm
Ya mybad.. just remove that part of the query :
GROUP BY TEST_DATE
April 26, 2005 at 8:41 am
Remi,
Thank you so much for your help...it works great, and I learned some things too!
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