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Finding the Maximum of a row

Author

Topic

velvet_tiger
Starting Member

12 Posts

Posted - 2013-04-22 : 14:02:11

Hi y'all,

I have created a query that pulls the below table.This table shows students' grade. I would like to output the row with the max(correctseq). The correctseq table represents the most recent grade that was entered.

[CODE]

TABLE 1

CRN TERM STUDENTID COURSE GRADE CREDITHRS SEQ CORRECTSEQ
10290 201210 1340 F1101 B- 6 4 1
10290 201210 1340 F1101 C 4 2 1
10290 201210 1340 F1101 D+ 3 1 1
10290 201210 1340 F1101 D+ 4 3 1
10290 201210 1340 F1101 P 3 1 2

[/CODE]

Therefore I would like the table to output looking like this:

[CODE]

TABLE 2

CRN TERM STUDENTID COURSE GRADE CREDITHRS SEQ CORRECTSEQ
10290 201210 1340 F1101 B- 6 4 1
10290 201210 1340 F1101 C 4 2 1
10290 201210 1340 F1101 D+ 4 3 1
10290 201210 1340 F1101 P 3 1 2

[/CODE]

When I tried doing a max(CORRECTSEQ) it doesn't work. Below is my code that I have thus far. Any help would be greatly appreciated.

James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2013-04-22 : 14:19:14

[code]select * from
( select *, rank() over (partition by crn,term,studentid,course order by correctseq desc) as RN
from YourTable
) s where RN = 1;[/code]

velvet_tiger
Starting Member

12 Posts

Posted - 2013-04-22 : 15:08:15

Hi James,

I tried this but it does not work. It only outputs those with a CORRECTSEQ of 1.

James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2013-04-22 : 15:11:27

Sorry about that; see below

select * from
( select *, rank() over (partition by crn,term,studentid,course,seq order by correctseq desc) as RN
  from YourTable
) s where RN = 1;

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