Sql Server设置主键和外键

设置主键

https://jingyan.baidu.com/article/9158e0003349a7a2541228fd.html

设置外键

https://jingyan.baidu.com/article/a3761b2bdf0a4b1576f9aa26.html

先设置主键，不设置主键设置外键的设不了