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my $rows = $GetAssignmentID_sth->rows;
  if($rows > 0) {
...
          push(@AssignmentIDs, $AssignmentID);
    }
  }

while (my ($AssignmentID, $UserCount) = $GetAssignmentID_sth-> fetchro
+w_array() )  {
     push(@AssignmentIDs, $AssignmentID);
}