how to choose a subsample based on list of values proc sql

[SeanZ]

I have a problem like this. I have two tables. One table only contains one variable, patient ID. The second one has two variables, patient ID and another variable, say, patient age. the second dataset is very large. Now I would like to subsample the second dataset to include ONLY patient IDs that are in the first table.

I tried to write someting like below, but it didn't work. BY NOT USING merge, is it possible to do this in the similiar way I wrote? Thank you.

proc sql;

   create table want as

  select *

  from table b

 where b.patientID in a.patientID;

quit;

[art297]

Your code is close. Try something like:

data small;
  input patientID;
  cards;
1
2
3
;
data large;
  input patientID age;
  cards;
1 10
2 11
3 12
4 13
5 14
6 15
7 16
;

proc sql;
  create table want as
    select b.*
      from small a,large b
        where b.patientID eq a.patientID
  ;
quit;

Art, CEO, AnalystFinder.com

[kiranv_]

this should work

proc sql;

   create table want as

  select a.*

   from bigtable a

 inner join smalltable b

on  a.patientID = b.patientID;

quit;

or

proc sql;

   create table want as

  select*

   from bigtable

 where patientID in (select patientID from smalltable);

quit;