SQL Server Group By Combine Pivot Table Approaches - sql-server

Question

I have tables which designed like survey questions.
Answer table store like below. One answer related with three questions. QuestionId 1 and QuestionId 2 store Yes or No answers. If QuestionId 1 and QuestionId 2 both of them answer Yes, I want QuesiontId 3 to sum count with column value otherwise alias should be Others. Which approach is better , could u please help :)
AnswerId | QuestionId | QuestionOptionText
---------+------------+-------------------
1 | 1 | No
1 | 2 | No
1 | 3 | 0
--------------------------------------
2 | 1 | Yes
2 | 2 | No
2 | 3 | 0
--------------------------------------
3 | 1 | No
3 | 2 | Yes
3 | 3 | 1-10
--------------------------------------
4 | 1 | Yes
4 | 2 | Yes
4 | 3 | 1-10
--------------------------------------
5 | 1 | Yes
5 | 2 | Yes
5 | 3 | 11-20
Result should be like that
1-10 | 11-20 | Other
-----+-------+-------
1 | 1 | 3

Answer 1

I think you need a self join of the three types of question, and then the summing logic is easier. A different table structure would probably have simplified things. Normally you would have each question in a separate column.
select
sum(iif(ans1 = 'Yes' and ans2 = 'Yes' and ans3 = '1-10',1,0)) as '1-10',
sum(iif(ans1 = 'Yes' and ans2 = 'Yes' and ans3 = '11-20',1,0)) as '11-20',
sum(iif(ans1 <> 'Yes' or ans2 = 'Yes',1,0)) as 'other'
from (
select QuestionOptionText as ans1 from t where QuestionId = 1
) as a1
inner join (
select QuestionOptionText as ans2 from t where QuestionId = 2
) as a2
on a1.AnswerId = a2.AnswerId
inner join (
select QuestionOptionText as ans3 from t where QuestionId = 3
) as a3
on a1.AnswerId = a3.AnswerId

Answer 2

Is this what you want?
select sum(case when QuestionOptionText = '1-10' then 1 else 0 end),
sum(case when QuestionOptionText = '11-20' then 1 else 0 end),
sum(case when QuestionOptionText not in ('1-10', '11-20') then 1 else 0 end)
from t
where QuestionId = 3;

Answer 3

You could do this with two levels of aggregation. First compute the outcome of each series of answerId, the pivot the resultset:
select
sum(case when res = '1-10' then 1 else 0 end) res_1_10,
sum(case when res = '11-20' then 1 else 0 end) res_1_20,
sum(case when res = 'Other' then 1 else 0 end) res_other
from (
select
case when max(case when QuestionId in (1, 2) then QuestionOptionText end) = 'Yes'
then max(case when QuestionId = 3 then QuestionOptionText end)
else 'Other'
end res
from mytable
group by answerId
) t