然而要注意，如果有语句遭到失败，那么表将被标记为不可访问，而且必须被删除。
However, be warned that if there is a statement failure, the table will be marked as inaccessible and must be dropped.
如果另一个模式中的对象依赖于被删除的对象，那么应用默认的drop语句语义。
If objects in another schema depend on an object being dropped, the default drop statement semantics apply.
如果有一条语句失败，那么这个表将被标记为不可访问的，并且需要被删除掉。
If there's a statement failure, the table will be marked as inaccessible and must be dropped.
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