Remove duplicates thru datastep

[BrahmanandaRao]

data new;
input Client_No$ Client_name$&20.;
cards;
1234 Julie
1234 Julie Tremblay
4567 George
5678 Alex
5678 Alexander
9123 Bob
;
run;

proc sort data=new;
by Client_No;
run;

How to remove duplicates thru datastep (first.and last.)

[Astounding]

I don't see any duplicates.  What would you like the result to be?

[Kurt_Bremser]

You already have it. Use a BY statement and either the first. or last. variable in a subsetting IF. After 340+ posts here, this will be child's play for you.