How To Change the Name of a Database User in SQL Server?

If you want to change the name of an existing database user, you can use the "ALTER USER" statement as shown in the tutorial exercise below:

-- Login with "sa"

USE FyiCenterData;
GO

ALTER USER Fyi_User WITH NAME = Dba_User; 
GO

-- List all user names
SELECT name, sid, type, type_desc 
   FROM sys.database_principals WHERE type = 'S';
GO
name                 sid                      type type_desc
-------------------- ------------------------ ---- ---------
dbo                  0x01                     S    SQL_USER
guest                0x00                     S    SQL_USER
INFORMATION_SCHEMA   NULL                     S    SQL_USER
sys                  NULL                     S    SQL_USER
Dba_User             0x5EB8701EAEBAA74F86F... S    SQL_USER

The of the last user changed from "Fyi_User" to "Dba_User".

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