Add a numeric suffix after matching of two lists

[NewUsrStat]

Hi guys, 

suppose to have the following dataset: 

data DB1;
input ID :$20. ;
cards;
8
8
8 
170
170
170
166
166
166
;
run;

and a list: 

data DB2;
input ID :$20. ;
cards;
8
170
152
166
;
run;

Is there a way to match DB1 with DB2 and every time IDs of DB2 are found in DB1 a suffix "999" will be added?

Desired output: 

data DB3;
input ID :$20. ;
cards;
8999
8999
8999 
170999
170999
170999
166999
166999
166999
;
run;

Thank you in advance. 

Best

[yabwon · Accepted solution]

data db3_test;
  if 1=_N_ then
    do;
      declare hash h(dataset: "db2");
      h.defineKey('ID');
      h.defineDone();
    end;
  set db1;

  if h.check()=0 then id = cats(id,'999');
run;
proc print;
run;

[yabwon]

According to your description this:

170999
170999
170999

should not exist in DB3.

[NewUsrStat]

Sorry I edited. I made a mistake!