If it is not specified, the system USES the fully qualified constraint name.

如果它没有被指定，系统会使用一个全约束名称。

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Find the constraint name for the unique/primary key, disable the constraint and drop the tablespace again.

找到那些惟一/主键约束名，禁用这些约束然后再次删除表空间。

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Modify a unique constraint when you want to change the columns that the constraint is attached to, change the constraint name, or set additional properties for the constraint.

当想要更改约束所附加到的列、更改约束名称或设置约束的附加属性时，可修改唯一约束。

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