Need assistance with a SQL query involving multiple sorts - sql

Question

I'm not sure if this is even possible, but my head starts to hurt when thinking about how to solve this. I've read on subqueries and PARTITION but I'm outside my knowledge. Here is a sample of my data:
TestID StudentID ComponentID Score
-------------------------------------
14919 3445 1 20
14919 3445 4 17
14919 3445 8 20
14919 3445 11 19
14919 3445 13 19
11339 3448 1 15
11339 3448 4 23
11339 3448 8 23
**11339 3448 11 22**
11339 3448 13 20
**14773 3448 1 20**
14773 3448 4 21
**14773 3448 8 23**
14773 3448 11 21
**14773 3448 13 21**
There can be multiple test attempts attached to the same StudentID. Attempts are noted by TestID.
I need to be able to query for the highest test score per TestComponentID over all attempts for each StudentID. There are only 5 component IDs. So for StudentID = 14773, between both ComponentID of 1, I just need the highest score. I would need the same for 4, 8, 11 and 13. I hope that makes sense. I highlighted the rows that would need to be returned. Any help is greatly appreciated.
Here is the query I've attempted. It just returns the same number of rows as the original.
SELECT DISTINCT
sts.StudentStandardizedTestID,
sts.StandardizedTestComponentID,
sts.StudentID,
MAX(sts.score) OVER (PARTITION BY sts.StudentID) HIGHSCORE
FROM
StandardizedTestScore sts
JOIN
StudentStandardizedTest sst ON sst.StudentStandardizedTestID = sts.StudentStandardizedTestID
AND sst.standardizedtestid = 1
WHERE
sst.TranscriptSchoolID = 10
AND sts.StandardizedTestComponentID = 1
OR sts.StandardizedTestComponentID = 4
OR sts.StandardizedTestComponentID = 8
OR sts.StandardizedTestComponentID = 11
OR sts.StandardizedTestComponentID = 13
ORDER BY
sts.studentid, sts.StandardizedTestComponentID

Answer 1

Below is the code to create your table and data.
CREATE TABLE StandardizedTestScore (`StudentStandardizedTestID` int(11) ,`studentid` int(11) ,`StandardizedTestComponentID` int(11),`score` int(11));
INSERT INTO StandardizedTestScore
(`TestID`, `studentid`, `componentid`, `score`)
VALUES
(14919,3445,1,20),
(14919,3445,4,17),
(14919,3445,8,20),
(14919,3445,11,19),
(14919,3445,13,19),
(11339,3448,1,15),
(11339,3448,4,23),
(11339,3448,8,23),
(11339,3448,11,22),
(11339,3448,13,20),
(14773,3448,1,20),
(14773,3448,4,21),
(14773,3448,8,23),
(14773,3448,11,21),
(14773,3448,13,21);
The query you are looking for is this..
SELECT studentid,StandardizedTestComponentID as componentID,MAX(score) AS score
FROM StandardizedTestScore
GROUP BY studentid,StandardizedTestComponentID
The results are this..
studentid ComponentID Score
3445 1 20
3445 4 17
3445 8 20
3445 11 19
3445 13 19
3448 1 20
3448 4 23
3448 8 23
3448 11 22
3448 13 21

Answer 2

It sounds to me like you need aggregation not sorting. Something like:
SELECT studentid,testid,componentid,MAX(score) AS score
FROM yourtable
GROUP BY studentid,testid,componentid