Dear All,
May I know how do go from 'have' to 'want' using proc sql?
Thanks a lot.
have
studyid test abc110 1 abc110 2 abc110 3 abc201 1 abc201 2 abc405 1 abc405 2
want
studyid test n abc110 1 1 abc110 2 1 abc110 3 1 abc201 1 2 abc201 2 2 abc405 1 3 abc405 2 3
The task defines the tool, so you use the data step for this:
data want;
set have;
by studyid;
if first.studyid then n + 1;
run;
No need to code yourself to insanity when there's such a simple solution.
Thanks @Kurt_Bremser for your solution using datastep.
But I need to perform this manipulation using proc sql.
BTW, this is not homework. I try to use proc sql more for my work now.
Thanks a lot.
@Miracle wrote:
But I need to perform this manipulation using proc sql.
Really a bad idea. Use a DATA step. Don't listen to me, listen to @Kurt_Bremser , he knows.
@Miracle wrote:
I try to use proc sql more for my work now.
Mastery of a tool also means knowing when not to use it.
SQL is very useful for a lot of things, but using it here, and in a production environment(!), would simply be stupid. The next one to maintain that code will come after you with murder in their eyes.
Thanks everyone for the advice.
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