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SQL script to return only one row per persnbr

Posted on 2011-09-14
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Last Modified: 2012-05-12
I am trying to put together a script to return only the highest numbered IDNbr from the data below for each person.  How would I script that?  Thanks.

PersNbr      IDNbr      DateLastMaint
1      1      8/1/2011
1      2      8/20/2011
1      3      9/5/2011
2      1      8/15/2011
2      1      8/18/2011
3      1      9/1/2011
4      1      8/5/2011
4      2      9/12/2011
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Question by:GBTIS
9 Comments
 
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Accepted Solution

by:
slightwv (䄆 Netminder) earned 400 total points
ID: 36537281
select pers, nbr, idnbr, datelastmaint from
(
select pers, nbr, idnbr, datelastmaint, row_number() over(partition by pers order by idnbr desc) myrownum from table
) where myrownum=1
0
 
LVL 74

Assisted Solution

by:sdstuber
sdstuber earned 50 total points
ID: 36537283
s elect persnbr,max(idnbr) from yourtable
group by persnbr
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LVL 40

Assisted Solution

by:Richard Quadling
Richard Quadling earned 50 total points
ID: 36537296
SELECT
	PersNbr,
	MAX(IDNbr) MaxIDNbr
FROM
	table
GROUP BY
	PersNbr

Open in new window


will return the highest IDNbr per PersNbr.

What do you want to do with the DateLastMaint?

Do you have an ID column?
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Author Comment

by:GBTIS
ID: 36537437
slightwv,

Your solution seems to work the best seeing as though I have multiple columns from multiple tables.  Can you help me get your query into my existing query.  Basically it goes like this.

Your Query Modified:

select cardnbr, currentstatus, idnbr, datelastmaint from
(
select cardnbr, currentstatus, idnbr, datelastmain, row_number() over(partition by cardnbr order by idnbr desc) myrownum from cardissue
) where myrownum=1

Exisitng Query to Combine With

select a.cardnbr, b.accountnbr, c.persnbr, d.currentstatus, e.accountstatus, e.office, e.phone
from card a, cardpers b, pers c, cardissue d, account e
where a.cardnbr=b.cardnbr and b.persnbr = c.persnbr and b.cardnbr=d.cardnr and b.accountnbr=e.accountnbr and b.cardtype<>'CARD'
0
 
LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 36537464
>>Exisitng Query to Combine With


Where is idnbr in that query?

Anyway you should just be able to take what you have and add the row_number function call using the proper columns in the query.
0
 

Author Comment

by:GBTIS
ID: 36537473
The idnbr would be in the cardissue (d) table.  I don't really need it in the output I just want the record with the highest value.
0
 
LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 36537517
Untested (just typed in):

select cardnbr, accountnbr, persnbr, currentstatus, accountstatus, office, phone from (
select a.cardnbr, b.accountnbr, c.persnbr, d.currentstatus, e.accountstatus, e.office, e.phone, row_number() over(partition by  c.persnbr order by d.idnbr) myrownum
from card a, cardpers b, pers c, cardissue d, account e
where a.cardnbr=b.cardnbr and b.persnbr = c.persnbr and b.cardnbr=d.cardnr and b.accountnbr=e.accountnbr and b.cardtype<>'CARD'
)
where myrownum=1
0
 

Author Comment

by:GBTIS
ID: 36537625
I was able to get that to work.  Thank you very much.
0
 
LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 36537637
Glad to help.
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