Question

How can I assign ID numbers based on two variables, A and B. It would be helpful if the code can handle multiple variables.
Here is what my data look like:

A       B  ID
5000136 5 1
5000136 5 1
5000225 4 2
5000225 4 2
5000225 4 2
5000225 6 3
5000225 6 3
5000225 6 3
5000327 2 4
5000327 2 4
....

ID is the result I want to produce.
Thanks in advance and I’m sorry if this question is duplicate.

Answer 1

data want;
set have;
by A B;
if first.B then id+1;
run;