# Fabricated but verisimilar example
  printf "UPDATE %s SET\n",      $table_name;
  printf "CUSTOMER_NAME = '%s'", $customer_name;
  printf ",\nAGE = %d",          $age     if defined $age;
  printf ",\nSTATUS = '%s'",     $status  if defined $status;
  printf ",\nADDRESS = '%s'",    $address if defined $address;
  printf ",\nPHONE = '%s'",      $phone   if defined $phone;
  printf "\nWHERE CUSTOMER_NUMBER = %d;\n\n", $customer_number;