oracle 10 数据库系统表应用

---查询共有多少个系统owner
select distinct owner from all_tab_comments t
--查询某个owner的所有表
select * from all_tab_comments t where owner='MARINEADMIN'
----列信息
select * from all_col_comments t where owner='MARINEADMIN'
--主键、外键对照
select OWNER, CONSTRAINT_NAME, CONSTRAINT_TYPE, TABLE_NAME, R_OWNER, R_CONSTRAINT_NAME from all_constraints
where  owner='MARINEADMIN' and (Constraint_Type='P' or Constraint_Type='R')
--主键、外键信息 
select * from all_cons_columns where owner='MARINEADMIN' order by Constraint_Name, Position
--每个表的数据行数
select owner,table_name,tablespace_name,num_rows from dba_all_tables t where t.owner='MARINEADMIN' 
--当前数据库用户（current schema -----marineadmin）下的用户表
select * from user_tables where tablespace_name='ZTK'
-- 所有表，字段名，类型，长度
select * from user_tab_columns order by table_name desc
--表示所有该用户可以访问的表
select * from all_tables
--是视图
select * from user_views
select * from all_views
--视图所有列信息
select * from user_tab_columns  where table_name  in (select view_name from user_views)