oracle 查询用户所有表及备注信息

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 ('test') ) 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