IF-THEN-ELSE without conditions for THEN

[Anna_dlC]

I have this long-running macro code to check for the existence of a local table but there are no statements after the THEN.  What happens?  What does SAS do?  I'm just trying to understand the logic

/* make sure the local table exist */

%if %sysfunc(exist(cdm.&tablename)) %then;  

    %else %do;

      %let man_month=%sysfunc(putn(%sysfunc(intnx(MONTH,%sysfunc(inputn(&sysdate9,date9.)),+1)),yymmn6.));

      %return;

   %end;

[PaigeMiller · Accepted solution]

If this macro finds that the table exists, it does nothing. If it does not exists then it does the calculation in the %ELSE portion.

[gamotte]

A more readable version would be to simply negate the condition :

%if not %sysfunc(exist(cdm.&tablename)) %then do;  
    %let man_month=....
%end;