I am trying to do this query. This is what I have.
My table is: Table
StudyID FacultyID Year Access1 Access2 Access3
1 1 2014 4 8 5
1 2 2014 8 4 7
1 1 2013 5 4 4
2 3 2014 4 6 5
2 5 2013 5 8 10
2 4 2014 5 5 7
3 7 2013 9 4 7
I want to group by StudyID and Year and get the minimum value of each field Access1 Access2 and Access3 and show only the last year, I mean for each group the first row. Here is the Result.
StudyID Year Access1 Access2 Access3
1 2014 4 4 5
2 2014 4 5 5
3 2013 9 4 7
This is my Query:
SELECT DISTINCT T.StudyID, T.Year, MIN(T.Access1), MIN(T.Access2), MIN(T.Access3)
FROM T
GROUP BY T.StudyID, T.Year
ORDER BY T.StudyID, T.Year DESC
I also tried with this one.
;WITH MyQuery AS ( SELECT DISTINCT T.StudyID, T.Year, MIN(T.Access1), MIN(T.Access2), MIN(T.Access3),ROW_NUMBER() OVER (PARTITION BY T.StudyID, T.Year ORDER BY T.StudyID, T.Year DESC) AS rownumber
FROM T GROUP BY T.StudyID, T.Year ORDER BY T.StudyID , T.Year DESC ) SELECT * FROM MyQuery WHERE rownumber = 1
Any success, I know I am missing something...but dont know what? Thanks in advance!!!!
You can GROUP BY StudyID, Year
and then in an outer query select the first row from each StudyID, Year
group:
SELECT StudyID, Year, minAccess1, minAccess2, minAccess3
FROM (
SELECT StudyID, Year, min(Access1) minAccess1, min(Access2) minAccess2,
min(Access3) minAccess3,
ROW_NUMBER() OVER (PARTITION BY StudyID ORDER BY Year DESC) AS rn
FROM mytable
GROUP BY StudyID, Year ) t
WHERE t.rn = 1
ROW_NUMBER
is used to assign an ordering number to each StudyID
group according to Year
values. The row with the maximum Year
value is assigned a rn = 1
.
Try this:
SELECT DISTINCT T.StudyID, T.Year, MIN(T.Access1), MIN(T.Access2), MIN(T.Access3)
FROM myTable T
WHERE T.Year = (SELECT MAX(T2.Year) FROM myTable T2 WHERE T2.StudyID = T.StudyID)
GROUP BY T.StudyID
Its giving the result you wanted in SQLite, but perhaps in SQL-Server needs some alias I'm not sure. Can't test it right now.
This is giving the answer you want
SELECT DISTINCT T.StudyID, T.Year, MIN(T.Access1) as Access1, MIN(T.Access2) as Access2, MIN(T.Access3) as Access3
FROM T T
WHERE T.Year = (SELECT MAX(T2.Year) FROM T T2 WHERE StudyID = T.StudyID)
GROUP BY T.StudyID, T.Year
Order by 1
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