how to combine two dataset to read only observations that are in both data

[hjjijkkl]

I have two dataset similar to the examples below, i wanted to read only observations that are in both data. 

Dataset one            Dataset two
ID   A   B                           ID   A  B
10   1   2                           10   0  4
20   3   4                           30   5  2
30   5   6                           40   7  3

I want the output that looks like this

ID   A   B                           
10   1   2                           
10   0  4  

30   5   6 

30   5  2                     

[andreas_lds]

What have you tried?

You need to interleave both datasets, outputting only those observations for which first.id and last.id are not true / one at the same time.

Spoiler

data want;
   set one two;
   by ID;
   
   if not (first.id and last.id);
run;

[Ksharp · Accepted solution]

data one;
input ID   A   B   ;
cards; 
10   1   2                          
20   3   4                          
30   5   6                 
;
data two;
input ID   A  B ;
cards; 
 10   0  4
 30   5  2
 40   7  3
 ;

 proc sql;
 create table want as
 select * from one where id in (select id from two)
 union all
 select * from two where id in (select id from one) 
order by id;
 quit;

[Kurt_Bremser]

Is it possible that there are two or more observations for a single ID in one dataset?