The TABULATE procedure prints headings only for values that appear in the input data set. If you want to include headings for all possible values, you have two different ways to create such a table:

• Use the PRELOADFMT option in the CLASS statement with the PRINTMISS option in the TABLE statement:

  data test;
     input dayofweek $10. @12 sales 5.;
     datalines;
  monday     10000
  tuesday    20000
  thursday   15000
  friday     12000
  ;
  run;

  proc format;
     value $weekd (notsorted) 'monday'='Monday'
                             'tuesday'='Tuesday'
                       'wednesday'='Wednesday'
                        'thursday'='Thursday'
                   'friday'='Friday';
  run;

  proc tabulate data=test order=data;
     class dayofweek /preloadfmt ;
     format dayofweek $weekd.;
     var sales;
     table dayofweek all, sales all / printmiss misstext='0';
  run;

   

• Use the CLASSDATA= and EXCLUSIVE options in the PROC TABULATE statement:

  data test;
     input dayofweek $10. @12 sales 5.;
     datalines;
  monday     10000
  tuesday    20000
  thursday   15000
  friday     12000
  ;
  run;

  data classdata;
     input dayofweek $10.;
     datalines;
  monday
  tuesday
  wednesday
  thursday
  friday
  ;
  run;

  proc tabulate data=test classdata=classdata exclusive order=data;
     class dayofweek;
     var sales;
     table dayofweek all, sales all / misstext='0';
  run;