Subtables in a table hierarchy cannot be transferred.
表层次结构中的子表不能被转移。
2
The typed table that is being dropped cannot have any subtables.
正被删除的类型化表不能拥有任何子类型。
3
The INHERIT SELECT PRIVILEGES clause specifies that any user or group holding the SELECT privilege on a supertable is to be granted an equivalent privilege on new subtables.