Proc Append

[Ronein]

Hello

I am using proc append

In resulted data set I see also column Y.

My question is why? 

I chose only columns X,ID so why also appear Y?

Data tbl1;
Input ID X Y;
cards;
1 10 30
2 20 40
;
Run;

Data tbl2;
Input ID X W;
cards;
1 70 90
2 60 60
;
Run;

proc append base=tbl1(Keep=ID X) data=tbl2(Keep=ID X) ;
run;
proc print data=tbl1 noobs;Run;
 

[japelin]

Read the help first.

It is well written.

https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/proc/p1bjrbc5esr90on12o8vs7gyv8ue.htm 

---

If you use the DROP=, KEEP=, or RENAME= options on the BASE= data set, the options affect ONLY the APPEND processing and does not change the variables in the appended BASE= data set. Variables that are dropped or not kept using the DROP= and KEEP= options still exist in the appended BASE= data set. Variables that are renamed using the RENAME= option remain with their original name in the appended BASE= data set.

[yabwon]

Try:

Data tbl1;
Input ID X Y;
cards;
1 10 30
2 20 40
;
Run;

Data tbl2;
Input ID X W;
cards;
1 70 90
2 60 60
;
Run;

proc append base=tbl1_ALL data=tbl1(Keep=ID X) ;
run;

proc delete data = tbl1;
run;

proc append base=tbl1_ALL data=tbl2(Keep=ID X) ;
run;
proc print data=tbl1_ALL noobs;Run;

B.