There are several levels of security to SQL Server. At the a base level, in order to be granted get access to a SQL Server, a user is required to have a login account.
There are two modes of security to SQL Server, distinguished by which program provides the authentication. NT Authentication provides that Windows NT (and/or its successors) verify verifies the identity of a user logging in. In this mode, the SQL Server will trust’ that Windows NT has verified that the user is who he says he is. The second method, SQL Server authentication, it is SQL: Server that authenticates the identity of the user. SQL Server authentication is typically used for internet Internet connections, since not all internet Internet users have Windows NT, and not all NT domains are trusted.
In addition to identifying users, it is sometimes convenient to define roles at the server level. Since within an organization, there are groups of users with similar access needs and levels, it may be convenient to define roles with specific levels of permissions. Once you have defined a role, you can assign users to that role, and those users inherit all of the privileges assigned to the...