oracle 查询表结构

SELECT t1.Table_Name AS "表名称",
t3.comments AS "表说明",
t1.Column_Name AS "字段名称",
t1.DATA_TYPE || '(' || t1.DATA_LENGTH || ')' AS "数据类型",
t1.NullAble AS "是否为空",
t2.Comments AS "字段说明",
t1.Data_Default "默认值"
--t4.created AS "建表时间"
FROM cols t1
LEFT JOIN user_col_comments t2
ON t1.Table_name = t2.Table_name
AND t1.Column_Name = t2.Column_Name
LEFT JOIN user_tab_comments t3
ON t1.Table_name = t3.Table_name
LEFT JOIN user_objects t4
ON t1.table_name = t4.OBJECT_NAME
WHERE NOT EXISTS (SELECT t4.Object_Name
FROM User_objects t4
WHERE t4.Object_Type = 'TABLE'
AND t4.Temporary = 'Y'
AND t4.Object_Name = t1.Table_Name)
and Table_Name not like '%$%'
ORDER BY t1.Table_Name, t1.Column_ID;