View All Tables and fields and Table comments. Field comments in Oracle

View All Tables and fields and Table comments. Field comments in Oracle

View All Tables and fields and Table comments. Field comments in Oracle

Get table:

Select table_name from user_tables; // The table owned by the current user
 
Select table_name from all_tables; // tables of all users
Select table_name from dba_tables; // includes the system table
Select table_name from dba_tables where owner = 'username'
 
User_tables:
Table_name, tablespace_name, last_analyzed, etc.
Dba_tables:
Ower, table_name, tablespace_name, last_analyzed, etc.
All_tables:
Ower, table_name, tablespace_name, last_analyzed, etc.
All_objects:
Ower, object_name, subobject_name, object_id, created, last_ddl_time, timestamp, status, etc.

Obtain table fields:

Select * from user_tab_columns where Table_Name = 'user table ';
Select * from all_tab_columns where Table_Name = 'user table ';
Select * from dba_tab_columns where Table_Name = 'user table ';
User_tab_columns:
Table_name, column_name, data_type, data_length, data_precision, data_scale, nullable, column_id, etc.
All_tab_columns:
Ower, table_name, column_name, data_type, data_length, data_precision, data_scale, nullable, column_id, etc.
Dba_tab_columns:
Ower, table_name, column_name, data_type, data_length, data_precision, data_scale, nullable, column_id, etc.

Get table comments:

Select * from user_tab_comments
User_tab_comments: table_name, table_type, comments
There are also dba_tab_comments and all_tab_comments, which have more ower columns than user_tab_comments.
Obtain field comments:
Select * from user_col_comments
User_col_comments: table_name, column_name, comments

There are also dba_col_comments and all_col_comments, which have more ower columns than user_col_comments.

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