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https://docs.microsoft.com/ja-jp/sql/t-sql/statements/alter-user-transact-sql
https://docs.microsoft.com/ja-jp/sql/sql-server/failover-clusters/troubleshoot-orphaned-users-sql-server
https://blog.dreamhive.co.jp/mkoba/%3Fp%3D973
https://stackoverflow.com/questions/6468813/assign-a-login-to-a-user-created-without-login-sql-server
https://www.postgresql.jp/document/9.4/html/sql-alteruser.html
https://www.shift-the-oracle.com/config/alter-user-basic-property.html
http://www.google.co.jp/url?url=http://www.sqlquality.com/ex2014/UpgradeTo2014_ex/Text/Step05-12.html
http://www.google.co.jp/url?url=http://dcx.sap.com/sa160/ja/dbreference/alter-user-statement.html
https://sudeeptaganguly.wordpress.com/2012/04/18/user-mapping-with-alter-user/
https://qiita.com/naaaoooo/items/30c4824dcb5e97df85a8
https://www.sqlservercentral.com/Forums/1135677/ALTER-USER-WITH-LOGIN-renames-the-user
https://www.projectgroup.info/tips/Oracle/SQL/SQL000011.html
https://www.postgresql.org/docs/11/sql-alteruser.html