我们可以从下面的查询中获得所有的表，包括列的详细信息:

SELECT * FROM user_tab_columns;

SELECT owner, table_name
  FROM dba_tables

This is assuming that you have access to the DBA_TABLES data dictionary view. If you do not have those privileges but need them, you can request that the DBA explicitly grants you privileges on that table, or, that the DBA grants you the SELECT ANY DICTIONARY privilege or the SELECT_CATALOG_ROLE role (either of which would allow you to query any data dictionary table). Of course, you may want to exclude certain schemas like SYS and SYSTEM which have large numbers of Oracle tables that you probably don't care about.

或者，如果您没有访问DBA_TABLES，您可以通过ALL_TABLES视图查看您的帐户访问的所有表:

SELECT owner, table_name
  FROM all_tables

不过，这可能是数据库中可用表的一个子集(ALL_TABLES显示用户已被授予访问权限的所有表的信息)。

如果你只关心你拥有的表，而不是那些你可以访问的表，你可以使用USER_TABLES:

SELECT table_name
  FROM user_tables

因为USER_TABLES只包含关于您拥有的表的信息，所以它没有OWNER列——根据定义，所有者就是您自己。

Oracle also has a number of legacy data dictionary views-- TAB, DICT, TABS, and CAT for example-- that could be used. In general, I would not suggest using these legacy views unless you absolutely need to backport your scripts to Oracle 6. Oracle has not changed these views in a long time so they often have problems with newer types of objects. For example, the TAB and CAT views both show information about tables that are in the user's recycle bin while the [DBA|ALL|USER]_TABLES views all filter those out. CAT also shows information about materialized view logs with a TABLE_TYPE of "TABLE" which is unlikely to be what you really want. DICT combines tables and synonyms and doesn't tell you who owns the object.

更进一步，还有一个名为cols (all_tab_columns)的视图，可用于确定哪些表包含给定的列名。

例如:

SELECT table_name, column_name
FROM cols
WHERE table_name LIKE 'EST%'
AND column_name LIKE '%CALLREF%';

查找名称以EST开头的所有表以及名称中任何位置包含CALLREF的列。

例如，根据表和列的命名约定，这可以帮助确定要连接哪些列。

要获得所有的表名，我们可以使用:

Select  owner, table_name  from all_tables;

如果你有dba权限，你可以使用:

Select owner, table_name from dba_tables;

select * from all_all_tables

开头附加的“all”给出了额外的3列，分别是:

OBJECT_ID_TYPE
TABLE_TYPE_OWNER
TABLE_TYPE

SQLcl(Oracle数据库的免费命令行接口)中的一个新特性是

表别名。

下面是几个示例，展示了该特性的用法和其他方面。首先，连接到sql命令行会话(windows中的sql.exe)。建议在运行任何其他显示数据的命令或查询之前输入此sqlcl特定命令。

SQL> set sqlformat ansiconsole     -- resizes the columns to the width of the 
                                   -- data to save space 

SQL >表

TABLES
-----------
REGIONS
LOCATIONS
DEPARTMENTS
JOBS
EMPLOYEES
JOB_HISTORY
..

要知道表的别名指的是什么，可以简单地使用alias list <alias>

SQL> alias list tables
tables - tables <schema> - show tables from schema
--------------------------------------------------

 select table_name "TABLES" from user_tables

您不必定义这个别名，因为它在SQLcl下默认存在。如果希望从特定模式列出表，使用新的用户定义别名并将模式名作为绑定参数传递，只显示一组列，则可以使用

SQL> alias tables_schema = select owner, table_name, last_analyzed from all_tables where owner =:ownr

此后，您可以简单地将模式名作为参数传递

SQL> tables_schema HR . SQL

OWNER   TABLE_NAME               LAST_ANALYZED
HR      DUMMY1                   18-10-18
HR      YOURTAB2                 16-11-18
HR      YOURTABLE                01-12-18
HR      ID_TABLE                 05-12-18
HR      REGIONS                  26-05-18
HR      LOCATIONS                26-05-18
HR      DEPARTMENTS              26-05-18
HR      JOBS                     26-05-18
HR      EMPLOYEES                12-10-18
..
..

一个更复杂的预定义别名称为Tables2，它显示其他几个列。

SQL> tables2

Tables
======
TABLE_NAME                 NUM_ROWS   BLOCKS   UNFORMATTED_SIZE COMPRESSION     INDEX_COUNT   CONSTRAINT_COUNT   PART_COUNT LAST_ANALYZED
AN_IP_TABLE                       0        0                  0 Disabled                  0                  0            0 > Month
PARTTABLE                         0        0                  0                           1                  0            1 > Month
TST2                              0        0                  0 Disabled                  0                  0            0 > Month
TST3                              0        0                  0 Disabled                  0                  0            0 > Month
MANAGE_EMPLYEE                    0        0                  0 Disabled                  0                  0            0 > Month
PRODUCT                           0        0                  0 Disabled                  0                  0            0 > Month
ALL_TAB_X78EHRYFK                 0        0                  0 Disabled                  0                  0            0 > Month
TBW                               0        0                  0 Disabled                  0                  0            0 > Month
DEPT                              0        0                  0 Disabled                  0                  0            0 > Month

要知道它在后台运行什么查询，请输入

alias list tables2

这将显示稍微复杂一些的查询以及SQL*Plus中常用的预定义列定义。

Jeff Smith在这里解释了更多关于别名的知识