Microsoft® SQL Server 2012 Unleashed

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Managing Principals

Principals are the entities that can request permission to SQL Server resources. They are made up of groups, individuals, or processes. Each principal has its own unique identifier on the server and is scoped at the Windows, server, or database level. The principals at the Windows level are Windows users or groups. The principals at the SQL Server level include SQL Server logins and server roles. The principals scoped at the database level include database users, data roles, and application roles.

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