Initial data commit

Task/Merge-and-aggregate-datasets/SAS/merge-and-aggregate-datasets.sas

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+  %let datefmt=E8601DA10.;
+  data patient;
+      infile "patient.csv" dsd dlm=',';
+      attrib
+          id length=4
+          lastname length=$10;
+      input id lastname;
+  data visit;
+      infile "visit.csv" dsd dlm=',';
+      attrib
+          id length=4
+          date informat=&datefmt format=&datefmt
+          score length=8;
+      input id date score;
+  proc sql;
+      select * from
+          (select id, max(date) format=&datefmt as max_date, sum(score) as sum_score,
+          	avg(score) as avg_score from visit group by id)
+          natural right join patient
+          order by id;