Why the values of these parameters can not be listed?

Why the values of these parameters can not be listed?
SQL> show parameter nls_time_format;
NAME                                 TYPE        VALUE
nls_time_format                      string
SQL> show parameter nls_date_format;
NAME                                 TYPE        VALUE
nls_date_format                      string

qkc wrote:
Do you mean the values are NULL? Why the default value not liested here.This is from my sandbox 10.2.0.4 database on linux. This was built just a few days ago and is absolutely default in all respects:
SQL> show parameter nls
NAME                                 TYPE        VALUE
nls_calendar                         string
nls_comp                             string
nls_currency                         string
nls_date_format                      string
nls_date_language                    string
nls_dual_currency                    string
nls_iso_currency                     string
nls_language                         string      AMERICAN
nls_length_semantics                 string      BYTE
nls_nchar_conv_excp                  string      FALSE
nls_numeric_characters               string
nls_sort                             string
nls_territory                        string      AMERICA
nls_time_format                      string
nls_time_tz_format                   string
nls_timestamp_format                 string
nls_timestamp_tz_format              string
SQL>Besides, it is a bad idea to depend on the defaults anyway. There are so many places they can be overridden that it is foolish for an app to depend on it. Rather, you should always be using (properly) the to_char and to_date functions to specify the formats at the individual sql statement. So the 'default' values become totally irrelevant.

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Why the values of these parameters can not be listed?

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