DESCRIBE DATABASE [EXTENDED] db_name
返回现有数据库的元数据（名称、注释和位置）。Return the metadata of an existing database (name, comment and location). 如果该数据库不存在，则会引发异常。If the database does not exist, an exception is thrown.
EXTENDED
显示数据库属性。Display the database properties.
谢谢。
