Oracle 表空间记录

select * from dba_tables where tablespace_name='DIGITPARTY'

所有表 DIGITPARTY为表空间名称，区分大小写

select * from user_tables 查看所有表

select * from all_views where owner=‘DIGITPARTY’ 所有视图 DIGITPARTY为用户名

select * from all_triggers where owner='DIGITPARTY'; 所有触发器

select table_name,count(*) from user_tab_columns where table_name in (select table_name from dba_tables where tablespace_name='DIGITPARTY')

group by table_name order by table_name 查看表的列数

select column_name,data_type ,data_length,data_precision,data_scale,table_name

from user_tab_columns where table_name in (select table_name from dba_tables where tablespace_name='DIGITPARTY') order by table_name 查看表的列项

select t.table_name,t.num_rows from user_tables t order by table_name 表的记录数

create or replace function count_rows(table_name in varchar2,
                              owner in varchar2 default null)
return number
authid current_user
IS
   num_rows number;
   stmt varchar2(2000);
begin
   if owner is null then
      stmt := 'select count(*) from "'||table_name||'"';
   else
      stmt := 'select count(*) from "'||owner||'"."'||table_name||'"';
   end if;
   execute immediate stmt into num_rows;
   return num_rows;
end;
select table_name, count_rows(table_name) nrows from user_tables

select t.*,i.index_type from user_ind_columns t,user_indexes i

where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name in (select table_name from user_tables) 查看索引

SELECT COUNT(*) FROM (

select t.*,i.index_type from user_ind_columns t,user_indexes i

where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name in (select table_name from user_tables) ) 查看索引数

2、查找表的主键（包括名称，构成列）：
select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name = 表名

3、查找表的唯一性约束（包括名称，构成列）：
select column_name from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'U' and au.table_name = 表名

4、查找表的外键（包括名称，引用表的表名和对应的键名，下面是分成多步查询）：
select * from user_constraints c where c.constraint_type = 'R' and c.table_name = 表名

外键约束的列名：
select * from user_cons_columns cl where cl.constraint_name = 外键名称

引用表的键的列名：
select * from user_cons_columns cl where cl.constraint_name = 外键引用表的键名

5、查询表的所有列及其属性：
select t.*,c.COMMENTS from user_tab_columns t,user_col_comments c where t.table_name = c.table_name and t.column_name = c.column_name and t.table_name = 表名

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