principal_id

int

ID of the principal. The value is unique within database.

sid

varbinary(85)

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

nvarchar (128)

Name of the principal. The value is unique within database.

type

nvarchar (128)

Description of principal type. All types are mapped to sid. The value can be one of the following:

• SQL USER
  
• WINDOWS LOGIN
  
• WINDOWS GROUP
  
• ROLE
  
• APPLICATION ROLE
  
• DATABASE ROLE
  
• USER MAPPED TO CERTIFICATE
  
• USER MAPPED TO ASYMMETRIC KEY
  
• CERTIFICATE
  
• ASYMMETRIC KEY
  

usage

nvarchar (128)

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:

• GRANT OR DENY
  
• DENY ONLY
  
• AUTHENTICATOR