Oracle查看表结构命令详解

select table_name from user_tables; //当前用户的表    
select table_name from all_tables; //所有用户的表  
select table_name from dba_tables; //包括系统表 
select table_name from dba_tables where owner='用户名' 
user_tables 
table_name,tablespace_name,last_analyzed等 
dba_tables 
ower,table_name,tablespace_name,last_analyzed等 
all_tables 
ower,table_name,tablespace_name,last_analyzed等 
all_objects 
ower,object_name,subobject_name,object_id,created,last_ddl_time,timestamp,status等 

select  from user_tab_columns where Table_Name='用户表'; 
select  from all_tab_columns where Table_Name='用户表'; 
select  from dba_tab_columns where Table_Name='用户表'; 
user_tab_columns 
table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等 
all_tab_columns  
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等 
dba_tab_columns 
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,column_id等 

select  from user_tab_ments 
user_tab_mentstable_name,table_type,ments 
--相应的还有dba_tab_ments，all_tab_ments，这两个比user_tab_ments多了ower列。 

select  from user_col_ments 
user_col_mentstable_name,column_name,ments