oracle 查詢表結構

SELECT 
    B.TABLE_NAME AS '表名',
    C.COMMENTS  AS '表說明', 
    B.COLUMN_ID AS '字段序號', 
    B.COLUMN_NAME  AS '字段名', 
    B.DATA_TYPE AS '字段數據類型', 
    B.DATA_LENGTH  AS '數據長度', 
    B.DATA_PRECISION AS '整數位',        
    B.DATA_SCALE  AS '小數位',        
    A.COMMENTS  AS '字段說明'   
FROM 
    ALL_COL_COMMENTS A, 
    ALL_TAB_COLUMNS B, 
    ALL_TAB_COMMENTS C 
WHERE 
    A.TABLE_NAME IN (SELECT U.TABLE_NAME FROM USER_ALL_TABLES U)    
    AND A.OWNER = B.OWNER    
    AND A.TABLE_NAME = B.TABLE_NAME    
    AND A.COLUMN_NAME = B.COLUMN_NAME    
    AND C.TABLE_NAME = A.TABLE_NAME    
    AND C.OWNER = A.OWNER    
    AND A.OWNER = 'xxx_db_name' --其中xxx_db_name為DB用戶名
    AND A.TABLE_NAME like '%xxx_table_name%' --xxx_table_name為表名稱
ORDER BY A.TABLE_NAME, B.COLUMN_ID;

SELECT
B.TABLE_NAME AS "表名",
C.COMMENTS AS "表說明",
B.COLUMN_ID AS "字段序號",
B.COLUMN_NAME AS "字段名",
B.DATA_TYPE AS "字段數據類型",
B.DATA_LENGTH AS "數據長度",
B.DATA_PRECISION AS "整數位",
B.DATA_SCALE AS "小數位",
A.COMMENTS AS "字段說明"
FROM
ALL_COL_COMMENTS A,
ALL_TAB_COLUMNS B,
ALL_TAB_COMMENTS C
WHERE
-- A.TABLE_NAME IN (SELECT U.TABLE_NAME FROM USER_ALL_TABLES U)
--AND
A.OWNER = B.OWNER
AND A.TABLE_NAME = B.TABLE_NAME
AND A.COLUMN_NAME = B.COLUMN_NAME
AND C.TABLE_NAME = A.TABLE_NAME
AND C.OWNER = A.OWNER
--AND A.OWNER = 'hbcxuser' --其中xxx_db_name為DB用戶名
AND A.TABLE_NAME like '%ACCESSTOKEN%' --xxx_table_name為表名稱
ORDER BY A.TABLE_NAME, B.COLUMN_ID;