Get all tables from information_schema, MySQL

Question

I just dont understand one thing. When I type:

SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = \'BASE TABLE\';

I get:

Answer 1

'information_schema' has ONLY SERVICE INFORMATION. It has info about table 'db' is exist, but it table IS NOT IN 'information_schema' DATABASE -- somewhere, but not in 'information_schema'.

Info about database which has needed table saved in TABLE_SCHEMA field

Answer 2

You select only table_name, but what about table_schema:

MariaDB [(none)]> SELECT table_name, table_schema FROM INFORMATION_SCHEMA.TABLES WHERE 

    TABLE_TYPE = 'BASE TABLE';
    +----------------------------------------------+--------------------+
    | table_name                                   | table_schema       |
    +----------------------------------------------+--------------------+
    | columns_priv                                 | mysql              |
    | db                                           | mysql              |
    | event                                        | mysql              |
    | func                                         | mysql              |
    | general_log                                  | mysql              |
    | help_category                                | mysql              |
    | help_keyword                                 | mysql              |
    | help_relation                                | mysql              |
    | help_topic                                   | mysql              |
    | host                                         | mysql              |
    | ndb_binlog_index                             | mysql              |
    | plugin                                       | mysql              |
    | proc                                         | mysql              |
    | procs_priv                                   | mysql              |
    | proxies_priv                                 | mysql              |
    | servers                                      | mysql              |
    | slow_log                                     | mysql              |
    | tables_priv                                  | mysql              |
    | time_zone                                    | mysql              |
    | time_zone_leap_second                        | mysql              |
    | time_zone_name                               | mysql              |
    | time_zone_transition                         | mysql              |
    | time_zone_transition_type                    | mysql              |
    | user                                         | mysql              |
    | cond_instances                               | performance_schema |
    | events_waits_current                         | performance_schema |
    | events_waits_history                         | performance_schema |
    | events_waits_history_long                    | performance_schema |
    | events_waits_summary_by_instance             | performance_schema |
    | events_waits_summary_by_thread_by_event_name | performance_schema |
    | events_waits_summary_global_by_event_name    | performance_schema |
    | file_instances                               | performance_schema |
    | file_summary_by_event_name                   | performance_schema |
    | file_summary_by_instance                     | performance_schema |
    | mutex_instances                              | performance_schema |
    | performance_timers                           | performance_schema |
    | rwlock_instances                             | performance_schema |
    | setup_consumers                              | performance_schema |
    | setup_instruments                            | performance_schema |
    | setup_timers                                 | performance_schema |
    | threads                                      | performance_schema |
    +----------------------------------------------+--------------------+

And you get:

MariaDB [(none)]> select * from mysql.db;
Empty set (0.00 sec)