how to combined two dataset without merging id

[stataq]

hello,

I have two dataset and I want to horizontal stacking them. the two dataset have same variable name but different rows. I would like to keep all cols and can add a_ , b_ in front of original col names. how can I achieve this?

data df_a;
infile datalines dsd truncover;
input id sex $ stop;
datalines;
1,Female,0
1,M,1
1,Male,0
1,F,0
1,,1
;

data df_b;
infile datalines dsd truncover;
input id sex $ stop;
datalines;
2,Female,0
1,M,1
1,Male,0
2,F,0
;

 there is no need to merge by id. just simply put two tables together. the output will look like below:

any suggestion? 

[PaigeMiller]

data want;
    set df_a df_b;
run;

[sbxkoenk]

proc datasets library=work NoList NoDetails memtype=data;
 delete want; run;
QUIT;
proc append base=want data=df_a; run;
proc append base=want data=df_b; run;

Koen

[stataq]

simple set statement will create vertical staking instead. 

[sbxkoenk]

Oh sorry. You want horizontal stacking (instead of vertical). 
PROC APPEND cannot do this.
Let me re-write.

Koen

[sbxkoenk · Accepted solution]

/* below df_c will contain only 4 observations --> wrong */
data df_c;
 set df_a(rename=(id=a_id sex=a_sex stop=a_stop));
 set df_b(rename=(id=b_id sex=b_sex stop=b_stop));
run;

/* below df_c will contain      5 observations --> okay  */
options MERGENOBY=WARN;
data df_c;
 merge df_a(rename=(id=a_id sex=a_sex stop=a_stop))
       df_b(rename=(id=b_id sex=b_sex stop=b_stop));
run;
/* end of program */

Koen