oracle 查询字段明细等

法3280

　　
select column_name,data_type,data_length
from all_tab_columns where table_name='T_CAKEY'
 
select * from user_tables --查询当前用户所拥有的表

select * from dba_tables --拥有DBA权限用户能查询所有的表

select * from all_tables --查询当前用户能访问的表
查询表字段明细
select column_name,data_type,data_length,DATA_PRECISION ,DATA_SCALE
from all_tab_columns where table_name='tablename'
字段注释
select   *   from   user_col_comments;
表注释
select   *   from   user_tab_comments;
表明细+表注释+字段明细+字段注释
select ATC.OWNER,atC.TABLE_NAME,utc.comments,ATC.COLUMN_NAME,ATC.DATA_TYPE,ATC.DATA_LENGTH,ATC.NULLABLE, ucc.comments from
(select ATC.OWNER,atC.TABLE_NAME,ATC.COLUMN_NAME,ATC.DATA_TYPE,ATC.DATA_LENGTH,ATC.NULLABLE
from all_tab_columns ATC where ATC.owner in (用戶名1，用戶名2........) ) atc
left outer join user_col_comments ucc on atc.table_name=ucc.table_name and atc.column_name=ucc.column_name
left outer join user_tab_comments utc on atc.table_name=utc.table_name
order by atc.table_name,atc.column_name;