是的，这是可能的。
但是，我不认为这是可能的凡（...）。

Yes, it is possible.
However, I don't think it's possible with WHERE IN (...).

下面是一个正常的，其中查询一个例子：

Here is an example for a normal WHERE query:

Public Function Test() As String
    Test = "Smith"
End Function

...然后：

...and then:

SELECT * FROM Users WHERE Name = Test();

它的工作原理，只要把函数只返回一个值。
但我认为它的不可以可以让你的函数返回类似史密斯，米勒并使用，如：

It works, as long as the function only returns one value.
But I think it's not possible to let your function return something like "Smith, Miller" and use that like:

SELECT * FROM Users WHERE Name In (Test());

（至少我不知道如何做到这一点）

(at least I don't know how to do it)