从视图层次里删除一个视图就同时删除了该视图引用的所有约束。

Removing a view from the view hierarchy also removes all the constraints that reference that view.

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写下在视图列中引用的所有字段的名称。

Write down the names of all fields referenced in the views' columns.

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请注意，如果函数、方法、触发器或视图中引用了某个全局变量，则不能删除该变量。

Please note that the global variable cannot be dropped if it is referenced in a function, method, trigger or view.

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