plsql查询数据库表结构及备注

SELECT t.table_name,
t.colUMN_NAME,
t.DATA_TYPE || \'(\' || t.DATA_LENGTH || \')\',
t1.COMMENTS
FROM User_Tab_Cols t, User_Col_Comments t1
WHERE t.table_name = t1.table_name
AND t.column_name = t1.column_name  AND t.TABLE_NAME = ;