求问几道System Design的问题，有大神给点思路吗

网上找的面经，有问系统设计，但是完全没思路啊。。。求救一下

How would you design a study to show the effectiveness/ineffectiveness of a program you built.

How you would design a payroll application. How you would generate a unique ID for each employee. and basically architectural tradeoffs you would consider.

How would you design a car radio system interface

lz能求个ms的面经吗？请问难度如何？

How you would generate a unique ID for each employee.

预估employee几十万人，所以放在relational DB里即可。做DB的主键自动生成一下UUID。
single writer/multiple reader即可。

如果（抬杠）说有几百万/几千万的员工，那就只能distributed UUID generator了。