Use sp_helpuser to report information about authorized users of the current database, where name_in_db is the user’s name in the current database:
sp_helpuser [name_in_db]
If you give a user’s name, sp_helpuser reports information about that user. If you do not give a name, it reports information about all users.
The following example shows the results of executing sp_helpuser without a parameter in the database pubs2:
sp_helpuser
Users_name ID_in_db Group_name Login_name ---------- -------- ---------- ---------- dbo 1 public sa marcy 4 public marcy sandy 3 public sandy judy 5 public judy linda 6 public linda anne 2 public anne jim 7 senioreng jim