怎樣獲得數據庫中字段的注釋信息？

獲取表字段：?1234 select *from user_tab_columnswhere Table_Name='用戶表'order by column_name獲取表注釋：?12345 select *from user_tab_commentswhere Table_Name='用戶表' order by Table_Name獲取字段注釋：?123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475 select *from user_col_commentswhere Table_Name='用戶