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03-18-2015

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Group by in UNIX

Hi team i have input file

Code:

name,dep,sal
xxx,1,100
yyy,2,,200
zzz,1,3000
eeee,1,200
ttttt,2,500
zzz,2,123
xyxy,3,1000

and output i require as below i.e highest value from colum3 grouping bydep, with all three columns name,dep,sal

Code:

name,dep,sal
zzz,1,3000
ttttt,2,500
xyxy,3,1000

im able to group by 2column and get max for each group but unable to get above output

zozoo

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03-18-2015

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Location: Aachen, Germany

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Show us your attempts. What stops you from printing the lines with respective groups' max?

RudiC

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03-18-2015

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108, 11

Join Date: Aug 2012

Last Activity: 26 June 2019, 12:56 AM EDT

Posts: 108

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Quote:

Originally Posted by RudiC

Show us your attempts. What stops you from printing the lines with respective groups' max?

Code:

have tried below

$ cat sample
xxx,1,100
yyy,2,,200
zzz,1,3000
eeee,1,200
ttttt,2,500
zzz,2,123
xyxy,3,1000
$ awk -F, '{if (a[$2]< $3)a[$2]=$3;}END{for(i in a){print i,a[i];}}' sample
1 3000
2 500
3 1000

I also want to print name of each entity with max value along with dep and sal

---------- Post updated at 06:38 PM ---------- Previous update was at 06:29 PM ----------

if have to to same thing in sql it would be and data isin table say temp_tbl

Code:

select name,dep,sal from temp_tbl where(dep,sal) in ( select dep,max(sal)from temp_tbl group by dep)

zozoo

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03-18-2015

Registered User

15,129, 5,008

Join Date: Jul 2012

Last Activity: 4 May 2020, 4:31 PM EDT

Location: Aachen, Germany

Posts: 15,129

Thanks Given: 735

Thanked 5,008 Times in 4,483 Posts

You were halfway there. Try

Code:

awk -F, '{if (a[$2]< $3) {a[$2]=$3;b[$2]=$1}} END{for(i in a){print b[i],i,a[i];}}' OFS="," file
zzz,1,3000
ttttt,2,500
xyxy,3,1000

or

Code:

awk -F, 'a[$2] < $3 {a[$2]=$3;b[$2]=$1} END{for(i in a){print b[i],i,a[i];}}' OFS="," file
zzz,1,3000
ttttt,2,500
xyxy,3,1000

This User Gave Thanks to RudiC For This Post:

RudiC

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