Oracle 查询注释 字段 等信息

---查询表的名称,字段信息以及字段注释

select 
      ut.COLUMN_NAME,--字段名称
      uc.comments,--字段注释
      ut.DATA_TYPE,--字典类型
      ut.DATA_LENGTH,--字典长度
      ut.NULLABLE--是否为空
from user_tab_columns  ut
inner JOIN user_col_comments uc
on ut.TABLE_NAME  = uc.table_name and ut.COLUMN_NAME = uc.column_name
where ut.Table_Name='RC_METADATA' 
order by ut.column_name
-------------执行结果
![这里写图片描述](https://img-blog.csdn.net/20170713170154882?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveWFsaTE5OTA1MTU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

--获取表字段:

select * 
from user_tab_columns 
where Table_Name='RC_METADATA' 
order by column_name

--获取表注释:

select * 
from user_tab_comments 
where Table_Name='RC_METADATA'
order by Table_Name

--获取字段注释:

select * 
from user_col_comments 
where Table_Name='RC_METADATA'
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='SS_MONITOR'

/* 
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='RC_METADATA';

select * from all_tab_columns where Table_Name='RC_METADATA';

select * from dba_tab_columns where Table_Name='RC_METADATA';

/* 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。 
*/
转 https://blog.csdn.net/yali1990515/article/details/75084471

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