Is there any difference write a keep in option and datastep?
Thanks,
Regards,
Ashwini
Only differnce is when it is applied.
If you use the KEEP= option on an input dataset then only those variables are loaded into the data step (or proc step) whereas when it is on the output dataset or the KEEP statement is used all of the variables are available during the step.
Another place where which makes a difference is when using RENAME statement. The second datastep below will generate an error.
data one ;
set sashelp.class;
keep name age;
rename age=age2;
run;
data two (keep=name age);
set sashelp.class;
rename age=age2;
run;
And, to add to Tom's comments, when used as an option in a data or set statement, the drop, keep and rename statements are applied in alphabetical order (i.e., first drop, then keep, then rename). Thus, using Tom's example,
data one;
set sashelp.class (keep=name age rename=(age=age2));
run;
would work as the rename wouldn't take effect until AFTER the keep statement.
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.