https://blog.engineer-memo.com/2014/12/21/sql-server-sql-database-%E3%81%AE-identity-%E3%83%97%E3%83%AD%E3%83%91%E3%83%86%E3%82%A3%E3%81%AE%E9%80%A3%E7%95%AA%E3%81%AE%E4%BF%9D%E8%A8%BC%E6%80%A7%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6/ SQL Serv…