Note: Only the keys have to be the same to get a match, both in the automatic comparison and in the user-defined function.
Note: Only the keys have to be the same to get a match, both in the automatic comparison and in the user-defined function.
注意：无论在自动比较的情况下，还是在用户自定义函数的情况下，所有的键必须相同（相互匹配）。