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Select row with Maximum sequence value

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Piscesian
Beginner

Joined: 17 Dec 2004
Posts: 14
Topics: 8
Location: Monrovia,California

Posted: Sun Dec 02, 2007 12:51 am Post subject: Select row with Maximum sequence value

Hi,
I have a DB2 table in which rows are stored in the following manner

Code:

SDNum SeqNum Textdata
84510 4 dddd
84510 3 cccc
84510 2 bbbb
84510 1 aaaa
84511 3 cccc
84511 2 bbbb
84511 1 aaaa
84512 2 yyyy
84512 1 xxxx

I need all the SDNum rows that have maximum SeqNum value
Considering the above example, output of SQL should be

Code:

84510 4 dddd
84511 3 cccc
84512 2 yyyy

Can anyone suggest how to achieve this?

Thanks,

kolusu
Site Admin

Joined: 26 Nov 2002
Posts: 12376
Topics: 75
Location: San Jose

Posted: Sun Dec 02, 2007 3:11 am Post subject:

Piscesian,

Try this untested sql

Code:

SELECT *
FROM TABLE
WHERE (SDNUM,SEQNUM) IN (SELECT SDNUM
,MAX(SEQNUM)
FROM TABLE
GROUP BY SDNUM)
;

Hope this helps...

Cheers
_________________
Kolusu
www.linkedin.com/in/kolusu

vivek1983
Intermediate

Joined: 20 Apr 2006
Posts: 222
Topics: 24

Posted: Sun Dec 02, 2007 11:17 pm Post subject:

Piscesian,

I guess the following will work also:

Code:

SELECT SDNUM, MAX(SEQNUM) AS SEQNUM, TEXTDATA FROM TABLE GROUP BY SDNUM

_________________
Vivek G
--------------------------------------
A dream is just a dream. A goal is a dream with a plan and a deadline. (Harvey Mackay)

kolusu
Site Admin

Joined: 26 Nov 2002
Posts: 12376
Topics: 75
Location: San Jose

Posted: Mon Dec 03, 2007 11:13 am Post subject:

vivek1983 wrote:

Piscesian,

I guess the following will work also:

Code:

SELECT SDNUM, MAX(SEQNUM) AS SEQNUM, TEXTDATA FROM TABLE GROUP BY SDNUM

Vivek,

Please TEST before you post. Your SQL will NOT work as the grouping is inconsistent. You should have a group by clause on both SDNUM and Textdata

Hope this helps...

Cheers
_________________
Kolusu
www.linkedin.com/in/kolusu

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