Oracle查看表结构命令详解

获取表:

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

获取表字段:

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

获取表注释:

select * from user_tab_comments 
user_tab_comments:table_name,table_type,comments 
--相应的还有dba_tab_comments,all_tab_comments,这两个比user_tab_comments多了ower列。

获取字段注释:

select * from user_col_comments 
user_col_comments:table_name,column_name,comments

总结

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