Dear SAS Community;
I have two variables, A and B, and would like to display the instances of B that do not occur in A. For example:
A B
1 1
3 2
4 3
6 4
7 5
10 6
7
8
9
10
Could someone please suggest some code for me to display my desired output? Thank you.
A SQL approach:
proc sql;
create table want as
select B from mydata o
where not exists
(select A from mydata i where o.b=i.a)
;
quit;
Hi There,
Using a hash object might help...
data mydata; input @1 A $3. @3 B $3.; cards; 1 1 3 2 4 3 6 4 7 5 10 6 7 8 9 10 ; run; data lookup; length B $3; set mydata(rename=(B=value)); if _N_=1 then do; declare hash ht(dataset:"mydata"); ht.defineKey("A"); ht.defineData("B"); ht.defineDone(); end; rc = ht.find(key:value); if rc ne 0 then output; keep value; run;
Cheers,
Michelle
A SQL approach:
proc sql;
create table want as
select B from mydata o
where not exists
(select A from mydata i where o.b=i.a)
;
quit;
A SAS/IML program:
proc iml;
A = {1,3,4,6,7,10};
B = T(1:10);
k = element(B, A); /* indicator variable: is B in A? */
BInA = loc(k=1);
BNotInA = loc(k=0);
print BInA, BNotInA;
Thank you for your responses! Proc sql worked great.
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.