Delving into the Distinctions: Users vs. Logins in SQL Server
Despite their apparent simplicity, the concepts of users and logins in SQL Server can be complex. This confusion stems from the seemingly symbiotic relationship between the two entities.
Understanding the Purpose of Logins
A login serves as an access point to the server itself. It grants privileges to enter the SQL Server instance and authorizes authentication methods, such as a Windows account or SQL Server credentials. Essentially, a login establishes the initial connection to the server.
The Role of Users
In contrast, a user represents an identity within a specific database. Users are created to associate with the data and objects within that database. A single login can connect to multiple databases, creating corresponding users in each one. These users inherit the access rights granted to their login but can also have specific permissions defined within their respective databases.
Why the Distinction?
The separation between logins and users provides several advantages:
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