Oracle数据库实现方式查询所有表实用指南

作者：袖梨 2026-09-09

平时做技术实践时，很多问题不是概念不会，而是细节没串起来。拿“Oracle数据库实现方法查询所有表”来说，它看着像小点，放到项目里常会牵出环境、配置、兼容性和维护成本。下面按实际采用顺序，把思路、关键写法和容易踩坑的地方讲清楚，便于大家直接对照操作。

1、查询当前数据库下的所有表
2、查询当前登录用户的所有表
3、查询所有用户的表,视图等
4、查询本用户的表,视图等
5、查询所有用户的表的列名和注释
6、查询本用户的表的列名和注释
7、查询所有用户的表的列名等信息
8、查询本用户的表的列名等信息
9、查询一个数据库中所有表的大小并排序
总结

1、查询当前数据库下的所有表

select * from all_tables where owner = 'TEST';

注：all_tables查出来是查得所有用户下的表，当然也包括你登录的用下的表，随后加一个where你要查的那个用户名就能够了。（记得用户名要大写）

模糊查询该条件的表名称：

select * from all_tables where owner = 'TEST' and table_name like '%S%';

2、查询当前登录用户的所有表

select * from user_tables;

简写：

select * from tabs;

模糊查询该条件的表名称:

select * from user_tables where table_name like '%S%';

3、查询所有用户的表,视图等

select * from all_tab_comments;

4、查询本用户的表,视图等

select * from user_tab_comments;

5、查询所有用户的表的列名和注释

select * from all_col_comments;

6、查询本用户的表的列名和注释

select * from user_col_comments;

7、查询所有用户的表的列名等信息

select * from all_tab_columns;

8、查询本用户的表的列名等信息

select * from user_tab_columns;

注：

3-8号的都能够在后面加一个 where owner = 'TEST'
就是你要查的那个用户名下的信息

9、查询一个数据库中所有表的大小并排序

SELECT *
  FROM (SELECT T1.OWNER,
               T1.TABLE_NAME,
               ROUND(T1.TABLE_SIZE / 1024 / 1024) +
               ROUND(NVL(T3.LOB_DATA_SIZE, 0) / 1024 / 1024) TABLE_SIZE_MB,
               ROUND(NVL(T2.INDEX_SIZE, 0) / 1024 / 1024) +
               ROUND(NVL(T3.LOB_INDEX_SIZE, 0) / 1024 / 1024) INDEX_SIZE_MB,
               ROUND(T1.TABLE_SIZE / 1024 / 1024) +
               ROUND(NVL(T3.LOB_DATA_SIZE, 0) / 1024 / 1024) +
               ROUND(NVL(T2.INDEX_SIZE, 0) / 1024 / 1024) +
               ROUND(NVL(T3.LOB_INDEX_SIZE, 0) / 1024 / 1024 / 1024) SIZE_MB
          FROM (SELECT OWNER,
                       SEGMENT_NAME TABLE_NAME,
                       ROUND(SUM(BYTES)) TABLE_SIZE
                  FROM DBA_SEGMENTS
                 WHERE SEGMENT_TYPE LIKE 'TABLE%'
                 GROUP BY OWNER, SEGMENT_NAME) T1,
               (SELECT A.OWNER, A.TABLE_NAME, SUM(B.BYTES) INDEX_SIZE
                  FROM (SELECT OWNER, TABLE_NAME, INDEX_NAME
                          FROM DBA_INDEXES
                         WHERE INDEX_TYPE <> 'LOB') A,
                       (SELECT OWNER, SEGMENT_NAME, BYTES FROM DBA_SEGMENTS) B
                 WHERE A.OWNER = B.OWNER
                   AND A.INDEX_NAME = B.SEGMENT_NAME
                 GROUP BY A.OWNER, A.TABLE_NAME) T2,
               (SELECT A.OWNER,
                       A.TABLE_NAME,
                       SUM(B.LOB_DATA_SIZE) LOB_DATA_SIZE,
                       SUM(C.LOB_INDEX_SIZE) LOB_INDEX_SIZE
                  FROM (SELECT OWNER, TABLE_NAME, SEGMENT_NAME, INDEX_NAME
                          FROM DBA_LOBS) A,
                       (SELECT OWNER, SEGMENT_NAME, SUM(BYTES) LOB_DATA_SIZE
                          FROM DBA_SEGMENTS
                         GROUP BY OWNER, SEGMENT_NAME) B,
                       (SELECT OWNER, SEGMENT_NAME, SUM(BYTES) LOB_INDEX_SIZE
                          FROM DBA_SEGMENTS
                         GROUP BY OWNER, SEGMENT_NAME) C
                 WHERE A.OWNER = B.OWNER
                   AND A.SEGMENT_NAME = B.SEGMENT_NAME
                   AND A.OWNER = C.OWNER
                   AND A.INDEX_NAME = C.SEGMENT_NAME
                 GROUP BY A.OWNER, A.TABLE_NAME) T3
         WHERE T1.OWNER = T2.OWNER(+)
           AND T1.TABLE_NAME = T2.TABLE_NAME(+)
           AND T1.OWNER = T3.OWNER(+)
           AND T1.TABLE_NAME = T3.TABLE_NAME(+)
           AND T1.OWNER = UPPER('TEST')
         ORDER BY 5 DESC) X;