oracle

SELECT a.TABLE_NAME 表名
       a.COLUMN_NAME 字段名,
        DATA_TYPE ||decode(DATA_TYPE,'DATE','','CLOB','','BLOB','','BFILE','','FLOAT','','LONG RAW','','LONG','','RAW','(' || TO_CHAR(DATA_LENGTH) || ')',
               (decode(SIGN(instr(DATA_TYPE, 'CHAR')),1,
                 '(' || TO_CHAR(DATA_LENGTH) || ')',(decode(SUBSTR(DATA_TYPE, 1, 9),
                  'TIMESTAMP', '',
                 (decode(NVL(DATA_PRECISION, -1), -1,
                  '',(decode(nvl(DATA_SCALE, 0), 0,
                  '(' || to_char(DATA_PRECISION) || ')', '(' || to_char(DATA_PRECISION) || ',' ||
                 to_char(DATA_SCALE) || ')'))))))))) 字段类型,
        a.NULLABLE 允许为空,
        b.comments 字段注释
   FROM ALL_TAB_COLUMNS a,
        all_col_comments b
  WHERE b.table_name=a.TABLE_NAME
  and a.OWNER=b.owner
  and a.COLUMN_NAME=b.COLUMN_NAME
  and a.TABLE_NAME =upper( 'af_staffs')
    --AND a.OWNER =upper( 'OUTSIDE_ENTERPRISESTATETAX')
  ORDER BY COLUMN_ID;