Question

I am running the following SQL statement

SELECT
 su.Id
  ,rp.QuestionId
  ,rp.AnswerId
FROM SiteUser su
  JOIN Response rp ON su.Id = rp.SiteUserId
  JOIN Answer an ON rp.AnswerId = an.Id

Which results in the following ouput

UserId    QuestionId    AnswerId
--------------------------------
1         1             1
1         2             6
2         1             2
2         2             3
3         1             2
3         2             2

I would like to achieve the below output

UserId    Question1   Question2
-------------------------------
1         1           6
2         2           3
3         2           2

Can anyone help with writing the Pivot statement?

Answer 1

since you haven’t mentioned any RDBMS, this query below will work on almost all RDBMS.

SELECT  su.Id,
        MAX(CASE WHEN rp.QuestionId = 1 THEN rp.AnswerId ELSE NULL END) Question1,
        MAX(CASE WHEN rp.QuestionId = 2 THEN rp.AnswerId ELSE NULL END) Question2
FROM    SiteUser su
        INNER JOIN Response rp 
            ON su.Id = rp.SiteUserId
        INNER JOIN Answer an 
            ON rp.AnswerId = an.Id
GROUP BY su.Id