about OPEN function

[LinyuanQin]

Hi SAS team!

My code was like this:

%macro a;

data sample1;

a=1;

run;

data lack;

run;

%let s1=%sysfunc(open(sample1));

%let lk=%sysfunc(open(lack));

%if &s1>0 and &lk>0 %then %do;

      %put &s1 &lk;

  %end;

  %else %do;

      %put "one of the dataset can not be opened";

  %end;

%let rc=%sysfunc(close(&s1));

%let rc=%sysfunc(close(&lk));

%mend a;

%a;

i expected that the note of "one of the dataset can not be opened" were written to the LOG, but the result was "1 2". Would anyone could explain how it happened and demonstrate the usage of OPEN function or other functions if the former note would be written.

Appreciate any help!

Qinly

[Tom]

OPEN will return a file handle number. Hence the 1 and 2 that you see in the log.

They should both successfully open the datasets you just created .

[LinyuanQin]

Thank you, Tom. And if both data sets do exist, but one of them has no obs, just like data set lack, which function could achieve my purpose?

[Tom · Accepted solution]

You could try FETCH()

[LinyuanQin]

Thank you, Tom! I've solved it by your suggestion.