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Description ID of the credential. Is unique within the server. Name of the credential. Is unique within the server. Name of the identity to be used. This will generally be a Windows login. It need not be unique. Time at which the credential was created. Time at which the credential was modified.

Note that the use of the COLLATE operator in a filter expression also invalidates the use of an index on that column. We cover this in more detail in the next lesson.

IF IS_SRVROLEMEMBER ('sysadmin') = 1 print 'Current user''s login is a member of the sysadmin role' ELSE IF IS_SRVROLEMEMBER ('sysadmin') = 0 print 'Current user''s login is NOT a member of the sysadmin role'

The HAS_PERMS_BY_NAME function evaluates the effective permission of the cur rent user on a securable. For example, the following statement returns a value of 1 if the current user has the INSERT permission on the SalesPerson table in AdventureWorks:

To optimize queries, one of the first basic strategies is to minimize the number of join clauses used. Another consideration is that outer joins typically incur more cost than inner joins because of the extra work needed to find the unmatched rows. If only inner joins are used in a query, the behavior of the ON and WHERE clauses is the same; it does not matter if you put an expression in the ON or WHERE clause. Compare the following two queries; they both return the same results and will use equal execution plans.

SELECT has_perms_by_name('Sales.SalesPerson', 'OBJECT', 'INSERT')

For more information about creating credentials, search Books Online for CREATE CREDENTIAL (Transact SQL) or access msdn2.microsoft.com/en-us/library/ms189522(SQL.90).aspx.

You can configure SQL Server 2005 to use either of two authentication modes. In Windows authentication mode, you assign users permissions and privileges to SQL Server resources only through their Windows accounts and Windows group member ships. In SQL Server and Windows authentication mode, which is also known as mixed security, users can also connect to SQL Server by means of a separate SQL Server login and be assigned permissions and privileges through this login.

-- Query #1 SELECT p.ProductID, p.Name, sod.SalesOrderID FROM Production.Product AS p INNER JOIN Sales.SalesOrderDetail AS sod ON sod.ProductID = p.ProductID WHERE p.Color = 'Black'; -- Query #2 SELECT p.ProductID, p.Name, sod.SalesOrderID FROM Production.Product AS p INNER JOIN Sales.SalesOrderDetail AS sod ON sod.ProductID = p.ProductID AND p.Color = 'Black';

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If these queries had been written with an outer join, they would not be syntactically equal and could have substantially different performances.

Windows authentication mode leverages existing Windows user and group accounts for SQL Server. This mode allows Windows local or domain users to access databases without needing a separate SQL Server login ID and password. Windows authentica tion mode is beneficial to users because it prevents them from having to remember multiple passwords for Windows and SQL Server authentication. Using Windows authentication mode is also highly secure. Management of security is simplified. In addition, users are still subject to all the rules of the Windows security model, so you can use this model to lock accounts, audit logins, and force users to change their pass words periodically. With Windows authentication mode, SQL Server authenticates users in a manner based on their Windows user accounts and group memberships. As a DBA, you can thus assign database permissions to any Windows user or group account. By default, the local Administrator user account and the local Administrators group account in Windows are configured with full permissions to SQL Server.

You can use the Object Explorer component of SQL Server Management Studio to view the explicit permissions to a securable granted to a user account or database role, and to alter these permissions if they have been incorrectly configured. You can use the same tool to verify the effective permissions that result from the combination of inherited and explicit permissions.

Domain accounts are the best way to manage users who access the database from within the orga nization. Also, if you assign users to domain groups and then configure access for these groups in SQL Server, you reduce administration overhead.

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SQL Server and Windows Authentication Mode (Mixed Authentication Mode)