Roll up multiple rows into one - sql

Question

I have a table that looks like this:
USER_ID,ADDED_DATE,STATUS,COMPLETION_ID_TYPE,QA_OPTION,QA_OPTION_COUNT
12543,2020-06-01 00:00:00,qaComplete_L2,chart,Correct,3
12543,2020-06-01 00:00:00,qaComplete_L2,chart,Incorrect,3
12543,2020-06-12 00:00:00,qaComplete_L2,chart,Incorrect,1
12543,2020-06-12 00:00:00,qaComplete_L2,chart,Correct,1
I want to display the results as:
USER_ID ADDED_DATE STATUS COMPLETION_ID_TYPE L2 Correct L2 InCorrect
8388 6/01/20 0:00 qaComplete_L2 chart 3 3
8388 6/12/20 0:00 qaComplete_L2 chart 1 1
I have tried this but not getting the results I am expecting:
select distinct user_id,
added_date,
status,
completion_id_type,
max(case
when qa_option = 'Correct'
then qa_option_count
else 0
end) as L2_Correct,
max(case
when qa_option = 'Incorrect'
then qa_option_count
else 0
end) as L2_Incorrect
from qa_report2
where user_id = 12543
and status = 'qaComplete_L2'
group by user_id, status, added_date, completion_id_type,qa_option, qa_option_count
order by user_id, added_date;
;
USER_ID,ADDED_DATE,STATUS,COMPLETION_ID_TYPE,L2_CORRECT,L2_INCORRECT
12543,2020-06-01 00:00:00,qaComplete_L2,chart,0,3
12543,2020-06-01 00:00:00,qaComplete_L2,chart,3,0
12543,2020-06-12 00:00:00,qaComplete_L2,chart,1,0
12543,2020-06-12 00:00:00,qaComplete_L2,chart,0,1

Answer 1

You were almost there :)
I only removed the distinct and two last group by columns. Columns you need in the calculation, shouldn't appear in the group by clause, but only in the group function in the select clause.
So in the end, what I think you're looking for is:
select user_id,
added_date,
status,
completion_id_type,
max(case
when qa_option = 'Correct'
then qa_option_count
else 0
end) as L2_Correct,
max(case
when qa_option = 'Incorrect'
then qa_option_count
else 0
end) as L2_Incorrect
from qa_report2
where user_id = 12543
and status = 'qaComplete_L2'
group by user_id,
status,
added_date,
completion_id_type
--,qa_option
--,qa_option_count
order by user_id,
added_date;
Note: You should be aware that you're using max(), I can imagine that if multiple records exist, you actualy want to use sum(), but that really depends on your use case.

Answer 2

You can use the PIVOT to achieve it.
SELECT *
FROM (
SELECT USER_ID,
ADDED_DATE,
STATUS,
COMPLETION_ID_TYPE,
QA_OPTION_COUNT,
QA_OPTION
FROM QA_REPORT2
WHERE USER_ID = 12543
AND STATUS = 'qaComplete_L2'
) PIVOT (
MAX ( QA_OPTION_COUNT )
FOR QA_OPTION
IN ( 'Correct' AS L2_CORRECT, 'Incorrect' AS L2_INCORRECT )
);