Returns one row for every database principal that is part of the user token.
ID of the principal. The value is unique within database.
Security identifier of the principal if the principal is defined external to the database. For example, this can be a SQL Server login, Windows login, Windows Group login, or a login mapped to a certificate, otherwise, this value is NULL.
Name of the principal. The value is unique within database.
Description of principal type. All types are mapped to sid. The value can be one of the following:
Indicates the principal participates in the evaluation of GRANT or DENY permissions, or serves as an authenticator.
This value can be one of the following: