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 程式師世界 >> 數據庫知識 >> Oracle數據庫 >> Oracle教程 >> ORACLE查詢使用方法

ORACLE查詢使用方法

編輯:Oracle教程

   一、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;

  二、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的內存區裡的表

  SQL>select table_name,cache from user_tables where instr(cache,'Y')>0;

  三、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');

  四、序列號

  查看序列號,last_number是當前值

  SQL>select * from user_sequences;

  五、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');

  六、同義詞

  查看同義詞的名稱

  SQL>select * from user_synonyms;

  七、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;

  八、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');

  九、觸發器

  查看觸發器

  set long 50000;

  set heading off;

  set pagesize 2000;

  select

  'create or replace trigger "' ||

  trigger_name || '"' || chr(10)||

  decode( substr( trigger_type, 1, 1 ),

  'A', 'AFTER', 'B', 'BEFORE', 'I', 'INSTEAD OF' ) ||

  chr(10) ||

  triggering_event || chr(10) ||

  'ON "' || table_owner || '"."' ||

  table_name || '"' || chr(10) ||

  decode( instr( trigger_type, 'EACH ROW' ), 0, null,

  'FOR EACH ROW' ) || chr(10) ,

  trigger_body

  from user_triggers;

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