If you want to see a list of all user names defined in a database, you can use the system view, sys.database_principals as shown in this tutorial exercise:

-- Login with sa

-- Select a database

USE GlobalGuideLineDatabase;

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

ggl_User   0x5EB8701EAEBAA74F86F... S SQL_USER

(5 row(s) affected)

As you can see, there are 5 user names defined in "GlobalGuideLineDatabase". 4 are defined by SQL Server during the database creation process. Only the last one "ggl_User" was defined by you in the previous tutorial.