Answer / naga

firstly read the file into database or sequential file and
make sure the file has company as a column in this file and
give its output to aggregator and in aggregator give
group=company and column to calculate=sal and maximum value
for output column=maxsal and do mapping to the dataset and
you will get the required result.

Answer / amjad

Hi Naga,
If we use Aggregator stage, it will give the max value from
different groups, as per your example, it will group by
company, then it will give the max sal from each group. but
how to max sal from all the groups, i mean the out put
should be only one value.

Ex:

COMPANY,SAL
A, 2000
B, 3000
C, 4000
A,5000
B,6000
C,7000
A,8000
B,9000
C,9999

if we do like you mention output will be like :
comp,maxsal
A,8000
B,9000
C,9999

But, the output should be only
C,9999

Plese let me if iam wrong.

Answer / guest

Frist using Sortstage sort the records based on sal column
for desc order and Each record unqiely identify using
surogatekey after that filterstage filter the first record
based on sur column and drag and drop only in sal column
in the output.Then We get the Max sal

Answer / nandhini

Create one dummy key and set the value as 1 for all input
columns and use remove duplicate stage. Here use this dummy
as key and use sorting, partitioning for dummy and company
columns & use sorting (descending) for salary column and in
properties tab, select duplicate to retain as last.

Answer / sagnik

You need to sort by your SAL not COMPANY.

Answer / shar

ok lets us say after getting result like
a,8000
b,9000
c,9999
acc to nandhini using dummy key would give me
a,8000,1
b,9000,1
c,9999,1
then use rem duplicate stage then we get 9999 as output after we assign retain duplicates=last for dummykey col.
what if
i have diff data and got output like below after aggreagation
a,9000
b,18000
c,10000
now what...?

Answer / guest

U can use Aggregator stage in Datastage

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