[Oracle] Oracle 查询表信息获取表字段及字段注释

select * 
from user_tab_columns 
where Table_Name='用户表' 
order by column_name

select * 
from user_tab_comments 
where Table_Name='用户表'
order by Table_Name

select * 
from user_col_comments 
where Table_Name='用户表'
order by column_name
/* 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='zfxfzb'
/* 
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
相应的还有dba_col_comments，all_col_comments，这两个比user_col_comments多了ower列。 
*/