What is the best way to create extra rows by swapping variables?

[SAS_taozi]

Hi everyone,

I need to create extra rows by swapping variables. For example, I have a dataset with two variables first name and last name:

firstName lastName

Sara        Daner

And I want an extra row by swapping first name and last name, desired dataset will be like:

firstName lastName

Sara        Daner

Daner      Sara

What is the best way to do it? Thanks!

[Tom]

One way is to use RENAME= option.

data want;
  set have have(rename=(firstName=lastName lastName=firstName));
run;