查看當前用戶的缺省表空間
SQL>select username,default_tablespace from user_users;

查看當前用戶的角色
SQL>select * from user_role_privs;

查看當前用戶的系統權限和表級權限
SQL>select * from user_sys_privs;
SQL>select * from user_tab_privs;

查看用戶下所有的表
SQL>select * from user_tables;

顯示用戶信息(所屬表空間)
select default_tablespace,temporary_tablespace
from dba_users where username='GAME';

1、用戶

查看當前用戶的缺省表空間
SQL>select username,default_tablespace from user_users;

查看當前用戶的角色
SQL>select * from user_role_privs;

查看當前用戶的系統權限和表級權限
SQL>select * from user_sys_privs;
SQL>select * from user_tab_privs;

顯示當前會話所具有的權限
SQL>select * from session_privs;

顯示指定用戶所具有的系統權限
SQL>select * from dba_sys_privs where grantee='GAME';

顯示特權用戶
select * from v$pwfile_users;

顯示用戶信息(所屬表空間)
select default_tablespace,temporary_tablespace
from dba_users where username='GAME';

顯示用戶的PROFILE
select profile from dba_users where username='GAME';


2、表

查看用戶下所有的表
SQL>select * from user_tables;

查看名稱包含log字符的表
SQL>select object_name,object_id from user_objects
where instr(object_name,'LOG')>0;

查看某表的創建時間
SQL>select object_name,created from user_objects where object_name=upper('&table_name');

查看某表的大小
SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments
where segment_name=upper('&table_name');

查看放在ORACLE的內存區里的表
SQL>select table_name,cache from user_tables where instr(cache,'Y')>0;

3、索引

查看索引個數和類別
SQL>select index_name,index_type,table_name from user_indexes order by table_name;

查看索引被索引的字段
SQL>select * from user_ind_columns where index_name=upper('&index_name');

查看索引的大小
SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments
where segment_name=upper('&index_name');

4、序列號

查看序列號，last_number是當前值
SQL>select * from user_sequences;

5、視圖

查看視圖的名稱
SQL>select view_name from user_views;

查看創建視圖的select語句
SQL>set view_name,text_length from user_views;
SQL>set long 2000; 說明：可以根據視圖的text_length值設定set long 的大小
SQL>select text from user_views where view_name=upper('&view_name');

6、同義詞

查看同義詞的名稱
SQL>select * from user_synonyms;

7、約束條件

查看某表的約束條件
SQL>select constraint_name, constraint_type,search_condition, r_constraint_name
from user_constraints where table_name = upper('&table_name');

SQL>select c.constraint_name,c.constraint_type,cc.column_name
from user_constraints c,user_cons_columns cc
where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')
and c.owner = cc.owner and c.constraint_name = cc.constraint_name
order by cc.position;

8、存儲函數和過程

查看函數和過程的狀態
SQL>select object_name,status from user_objects where object_type='FUNCTION';
SQL>select object_name,status from user_objects where object_type='PROCEDURE';

查看函數和過程的源代碼
SQL>select text from all_source where owner=user and name=upper('&plsql_name');
--------------------------------------------------oracle 查詢 表字段 以及字段 數據類型 -----------------------------------------

第一種

select cname from col where tname='EMP';

第二種

select column_name from user_tab_columns where table_name='EMP';

 

 

介紹  如果查詢數據的  字段數據類型

select data_type from user_tab_columns where table_name='EMP';

 

 

兩個一起查

select data_type,column_name from user_tab_columns where table_name='EMP';

--------------------------------------------查詢 字段注釋---------------------------------------------

select * from user_col_comments ;//所有的注釋
select * from user_col_comments where table_name='你的表(emp)' ;//指定表的注釋









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