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Common table expressions (CTEs) are new to SQL Server 2005. A CTE is a named temporary result set that will be used by the FROM clause of a SELECT query. You then use the result set in any SELECT, INSERT, UPDATE, or DELETE query defined within the same scope as the CTE. The main advantage CTEs provide you is that the queries with derived tables become simpler, as traditional T-SQL constructs used to work with derived tables usually require a separate definition for the derived data (such as a temporary table). Using a CTE to define the derived table makes it easier to see the definition of the derived table with the code that uses it. A CTE consists of three main elements: Name of the CTE followed by the WITH keyword The column list (optional) The query that will appear within parentheses, ( ), after the AS keyword

If ACLs are enabled for a given device, you can use the setfacl command to set them. If this command isn t available, run apt-get install acl first. The use of setfacl is not too hard to understand: for example, setfacl -m u:linda,rwx somefile can be used to add user linda as a trustee (someone who has rights to a file) on the file somefile. This command does not change file ownership, though; it just adds to the access control list a second user who also has rights to the file. The normal output of the ls -l command does not show all users who have rights by means of an ACL, but the + character appears behind the permissions list on that file. To get an overview of all ACLs currently set to a given file, use the getfacl command. The following procedure gives you an opportunity to try it: 1. Make sure you are root and then create a file somewhere in the file system. You can use the touch command to create an empty file; for example, use touch somefile to create the file somefile. 2. Now use getfacl somefile to monitor the permissions that are set for this file. You will see an overview as in Listing 5-7, indicating only the default permissions that are granted to user, group, and others.

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Figure 4-1 presents the most important architectural features of ADO.NET. We ll discuss them in far greater detail in later chapters.

ADO.NET has two central components: data providers and datasets. A data provider connects to a data source and supports data access and manipulation. You ll play with three different ones later in this chapter. A dataset supports disconnected, independent caching of data in a relational fashion, updating the data source as required. A dataset contains one or more data tables. A data table is a row-and-column representation that provides much the same logical view as a SQL table. For example, you can store the data from the Northwind database s Employees table in a data table and manipulate the data as needed. You ll learn about datasets and data tables starting in 8. In Figure 4-1, notice the DataView class (in the System.Data namespace). This isn t a data provider component. Data views are used primarily to bind data to Windows and Web forms. We ll cover data views in 9. As you saw in Table 4-1, each data provider has its own namespace. In fact, each data provider is essentially an implementation of interfaces in the System.Data namespace, specialized for a specific type of data source. For example, if you use SQL Server, you should use the SQL Server data provider (System.Data.SqlClient) because it s the most efficient way to access SQL Server. The OLE DB data provider supports access to older versions of SQL Server as well as to other databases, such as Access, DB2, MySQL, and Oracle. However, native data providers (such as System.Data.OracleClient) are preferable for performance, since the OLE DB data provider works through two other layers, the OLE DB service component and the OLE DB provider, before reaching the data source.

To create a CTE, enter the following query into SSMSE and execute it. You should see the results shown in Figure 4-3. WITH TopSales (SalesPersonID,TerritoryID,NumberOfSales) AS ( SELECT SalesPersonID,TerritoryID, Count(*) FROM Sales.SalesOrderHeader GROUP BY SalesPersonID, TerritoryID ) SELECT * FROM TopSales WHERE SalesPersonID IS NOT NULL ORDER BY NumberOfSales DESC

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