code & mdf
https://www.microsoftpressstore.com/store/training-kit-exam-70-463-implementing-a-data-warehouse-9780735666092#downloads
70-463那个code文件夹:
chapter 6 lesson 3 的东西 挺好的, 不一定都要用到slowly changing dimension, 可以用判断 where not(每个字段=原来字段)