23         data gpdb1.tests;
24         input area_code $ flag $;
25         datalines;

NOTE: The data set GPDB1.TESTS has 4 observations and 2 variables.
NOTE: DATA statement used (Total process time):
      real time           2.43 seconds
      cpu time            0.01 seconds
      
30         ;

31         run;
32         
33         proc sort data=gpdb1.tests out=tests;
34         by area_code;
35         run;

NOTE: Sorting was performed by the data source.
NOTE: There were 4 observations read from the data set GPDB1.TESTS.
NOTE: The data set WORK.TESTS has 4 observations and 2 variables.
NOTE: PROCEDURE SORT used (Total process time):
      real time           1.25 seconds
      cpu time            0.01 seconds
      

36         
37         data _null_;
38         set tests;
39         by area_code;
40         run;

ERROR: BY variables are not properly sorted on data set WORK.TESTS.
area_code=txnfdh flag=1 FIRST.area_code=1 LAST.area_code=1 _ERROR_=1 _N_=3