Question

I have a table of questionnaire responses with a question ID, and a value that a user submitted.

I would like to get the counts of responses, and also the average for the whole question ID, so for example for question ID 1, there was a count of 3 for option 1, and acount of 2 for option 2, but the OVERALL average would be 7(sum of all optons) divided by 5(total submissions).

I can’t see how to do this with my group by, which does a total of resposnses grouped by questions ID and also option number.

Any pointers would be gratefully received!

Sample data would look like

questionID  ResponseValue
1           5
1           5
1           6
2           7
2           7
2           7
2           3

My expected output would be

questionID responseValue countOfResponses questionAverage
1          5             2                5.3333
1          6             1                5.3333
2          3             1                6
2          7             3                6

Answer 1

Are you looking for something like…
On a per-option with overall total, I would pre-query the per question sum(value of responses), then group just on the question so you have that for all entries… then query again, but on a per question/option… So, in this case, you are getting the percentage of the total a given response represents, not an “average”… To ensure you get decimal precision, I’ve added * 1.0000 so it goes to a decimal forced result column and not just integer.

select
      YT.QuestionID,
      YT.responseValue,
      count(*) as TotalOptResponses,
      TotalByQ.TotalQAverage
   from
      YourTable  YT
         JOIN ( select QuestionID,
                       avg(ResponseValue * 1.0000 ) as TotalQAverage
                   from
                      YourTable
                   group by
                      QuestionID ) TotalByQ
            ON YT.QuestionID = TotalByQ.QuestionID
   group by
      YT.QuestionID,
      YT.ResponseValue