SQL Server - 更改PK数据类型的最佳方法是什么？

I've currently got a database with about 20 reference tables, i.e. stuff like products, assets, depots, users, etc. This information is stored in a central database and is downloaded to PDAs of engineers who are out on the road. Every table in my database has a PK of UniqueIdentifier (i.e. a GUID).I've currently got a database with about 20 ref