oracle下通过表名查找字段名、字段类型、与字段描述

  SELECT      b.COLUMN_NAME,b.DATA_TYPE,a.COMMENTS  FROM      USER_TAB_COLUMNS b,USER_COL_COMMENTS a  WHERE      b.TABLE_NAME = 'tabelName' AND b.TABLE_NAME = a.TABLE_NAME AND b.COLUMN_NAME = a.COLUMN_NAME