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Oracle数据库实现查询所有表

2025-12-02 10:02:12 作者：笑锝没心没肺

文章总结了在数据库中查询表和列信息的方法,包括查询所有表、特定用户的表、表的列名和注释,以及如何根据表名进行模糊查询,它还提供了如何查询数据库中所有表的大小并进行排序的指令

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，然后加一个where你要查的那个用户名就可以了。（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号的都可以在后面加一个 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;

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。