查詢表字段明細
select column_name,data_type,data_length,DATA_PRECISION ,DATA_SCALE
from all_tab_columns where table_name='tablename'
字段注釋
select * from user_col_comments;
表注釋
select * from user_tab_comments;
表明細+表注釋+字段明細+字段注釋
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