how to output max value with id or obs number using PROC means?

[letssas]

a dataset looks like this:

obs id var1 var2
1 a 12 30
2 b 14 31
...

how to output max values of var1 and var2 with id or obs numbers using PROC means?

how to do this using PROC SQL?
thanks.

 

[ChrisW75]

You don't need proc means.

data outpt;
  set inpt;
  * either of these methods work *;
  maxval = max(of var1-var3);
  maxval = max(var1,var2,var3);

run;