正被删除的类型化表不能拥有任何子类型。
The typed table that is being dropped cannot have any subtables.
类型化表是一个使用用户定义的结构化类型定义的表。
A typed table is a table that is defined with a user-defined structured type.
当用作表的类型时，该表就被认为是一个类型化表(清单3)。
When used as the type for a table, the table is known as a typed table (Listing 3).
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