Count based on ID

[raddad34]

Hello everyone, I have a large dataset that looks like this:

data have;
input customerID product;
datalines;
A1 P4
A1 P6
A1 P2
A2 P3
A2 P4
A3 P1
;

I want to get a count of how many products each customerID has assigned to it. Each row is unique so there is no need to account for duplicates.

This is what I'm trying to achieve:

data want;

input customerID product count;
datalines;
A1 P4 3
A1 P6 3
A1 P2 3
A2 P3 2
A2 P4 2
A3 P1 1
;

[r_behata]

data have;
input customerID $ product $;
datalines;
A1 P4
A1 P6
A1 P2
A2 P3
A2 P4
A3 P1
;
run;

proc SQL;
Create table want as
select customerID,
	   product,
	   count(1) as count
from have
group by customerID;
Quit;

[mkeintz · Accepted solution]

If the data are sorted by customerid:

data want;
  set have (in=firstpass) have (in=secondpass);
  by customerid;
  if first.customerid then count=0;
  count + firstpass;
  if secondpass;
run;