How to avoid duplicate records while join table

[sanjaymane7]

Hi,

I am trying to merge three data sets. First data have 1 record, second data have 2 records and third data set have 4 records.

While merging records, duplicate values gets copied in left data set.

Please suggest how to avoid duplicate values

Example –

Data1

TransactionId	Premium
ICM_DEC_20_718256	1000000

Data2

TransactionId	Comm%	Commission
ICM_DEC_20_718256	10	100000
ICM_DEC_20_718256	7.5	75000

Data3

TransactionId	Rwd %	Reward Commission
ICM_DEC_20_718256	10	100000
ICM_DEC_20_718256	7.5	75000
ICM_DEC_20_718256	5	3000
ICM_DEC_20_718256	2	10000

Syntax -

Data want;

Set data1 (in=a) data2 (in=b) data3 (in=c);

By TransanctionId;

If a;

Run;

output -

TransactionId	Premium	Comm %	Commission	Rwd %	Reward
ICM_DEC_20_718256	1000000.00	10.00	100000.00	10	100000
ICM_DEC_20_718256	1000000.00	7.50	75000.00	7.5	75000
ICM_DEC_20_718256	1000000.00	7.50	75000.00	5	3000
ICM_DEC_20_718256	1000000.00	7.50	75000.00	2	10000

I don't want duplicate values in premium, comm % and commission variables.

[utrocketeng]

PROC SQL;
create table want as
SELECT
a.transactionid
,c.premium
,b.Comm%
,b.Commision
,a.rwd%
,a.reward
FROM
data3 a
left join data2 b on a.transactionid = b.transactionid and a.[reward commision] = b.commision
left join data1 c on a.transactionid = c.transactionid and a.[reward commision] = c.premium
;
quit;

[Kurt_Bremser · Accepted solution]

data data1;
input TransactionId :$20. Premium;
datalines;
ICM_DEC_20_718256 1000000
;

data data2;
input TransactionId :$20. Comm_percent Commission;
datalines;
ICM_DEC_20_718256 10 100000
ICM_DEC_20_718256 7.5 75000
;

data data3;
input TransactionId :$20. Rwd_percent Reward_Commission;
datalines;
ICM_DEC_20_718256 10 100000
ICM_DEC_20_718256 7.5 75000
ICM_DEC_20_718256 5 3000
ICM_DEC_20_718256 2 10000
;

data want;
if 0 then set data1 data2 data3;
call missing(of _all_);
merge
  data1
  data2
  data3
;
by TransactionId;
run;

Please post data as data steps with datalines, so we do not have to write code to read it into datasets.

[PhilC]

I'm always outdone by Kurt, but my two cents.  This code might be use to someone learning lag and DO Whitlock loops.

data have;
  infile datalines dlm="09"x;
  input TransactionId	$17. Premium	Comm Commission	Rwd	Reward;

datalines;
ICMlag_DEClag_20lag_718256	1000000	10	100000	10	100000
ICMlag_DEClag_20lag_718256	1000000	7.5	75000	7.5	75000
ICMlag_DEClag_20lag_718256	1000000	7.5	75000	5	3000
ICMlag_DEClag_20lag_718256	1000000	7.5	75000	2	10000
;
run;

data want;
  do until (last.TransactionId);
    set have;
      by TransactionId;
    /*lags*/
      lag_Premium=lag(Premium);
      lag_Comm =lag(Comm);
      lag_Commission=lag(Commission);
    if not first.TransactionId then do;
      if lag_Premium=(Premium)       then Premium=.;
      if lag_Comm =(Comm)            then Comm=.;
      if lag_Commission=(Commission) then Commission=.;
    end;
    output;
  end;
  drop lag_:;
  stop;
run;
options missing=" ";
proc print noObs;
  var _all_;
run;