Oracle gets all the table names of a database and the column attributes of the table

select table_name from user_tables; //The current user's table       

select table_name from all_tables; //All users' table   

select table_name from dba_tables; //Include system tables 

select table_name from dba_tables where owner='user name' 

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. 

Get table fields: 

select * from where user_tab_column '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等 

all_tab_columns ： 

ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等 

dba_tab_columns： 

ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等 

获取表注释： 

select * from user_tab_comments 

user_tab_comments：table_name,table_type,comments 

--相应的还有dba_tab_comments，all_tab_comments，这两个比user_tab_comments多了ower列。 

获取字段注释： 

select * from user_col_comments 

user_col_comments：table_name,column_name,comments