Duplicate value within by group

[mlogan]

Hi All,

Can someone tell me how to get the duplicate value within by group. Thanks,

ID     Subject

100   English

100   Math

100   Biology

111   English

111   Biology

111   Math

111   Math

111  Biology

112  Chemistry

112   English

112   Physics

112   Math

112   English

Outpu table will be:

ID     Subject

111   Biology

111   Biology

112   English

112   English

[Reeza]

proc sort data=have;
by id subject;
run;

data dups;
set have;
by id subject;
if not (first.subject and last.subject) then output;
run;

[SAS_inquisitive]

proc sort data=have nodupkey dupout=dups;
  by id subject;
run;

[Reeza]

Proc Sort identifies one of the duplicate records not both.  

If you want to identify both using PROC SORT use the NOUNIQUEKEY option instead.

proc sort data=have nouniquekey out=want;
  by id subject;
run;

proc print data=want;
run;

[RW9]

Or:

proc sort data=have out=nondups dupout=want nodupkey;
  by id subject;
run;

This will give you a dataset want which has all the duplicate values, you can sort it again nodupkey to get distinct values, also you do:

proc sql;
 create table WANT as
 select distinct ID,SUBJECT
 from HAVE
 group by ID,SUBJECT
 having count(*) > 1;
quit;