IDing on one column

[Planck]

Hi

I have a table A with several variables.

Among all these variables I have one variable called "name". Data are sorted by this variable.

I can have several rows for one value of the column "name".

I would like to distinct them by adding an index column named ID.

An example of my table A

... name ...
... A ...
... B ...
... B ...
... D ...
... E ...
... E ...
... E ...
...

The table I need is like this:

... name ID ...
... A 1 ...
... B 1 ...
... B 2 ...
... D 1 ...
... E 1 ...
... E 2 ...
... E 3 ...
...

Do you know how I can do it?

Thanks

[RW9 · Accepted solution]

Post test data in the form of a datastep, I am not here to type that in.  So this code is just and example:

data want;
  set have;
  by name;
  retain id;
  id=ifn(first.name1,id+1);
run;

[Planck]

Thanks for the answer.

Small mistake I correct:

data want;
  set have;
  by name;
  retain id;
  id=ifn(first.name,1,id+1);
run;