---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