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In this chapter s introduction, I talked about the benefits that set-based solutions have over cursor-based ones I mentioned both logical and performance benefits For the most part, efficiently written set-based solutions will outperform cursor-based solutions for two reasons First, you empower the optimizer to do what it s so good at generating multiple valid execution plans and choosing the most efficient one When you apply a cursor-based solution, you re basically forcing the optimizer to go with a rigid plan that doesn t leave much room for optimization at least not as much room as with set-based solutions Second, the processing of each cursor row involves overhead that is not applicable when processing set-based code You can run some simple tests to witness and measure this overhead for example, by comparing the costs of scanning a table by using a simple query and by using a cursor .

AllowThousands | AllowCurrencySymbol HexNumber AllowLeadingWhite | AllowTrailingWhite | AllowHexSpecifier AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign | AllowParentheses | AllowDecimalPoint | AllowThousands AllowExponent Here s a code fragment showing how to parse a hexadecimal number:

MIN([Column1], [Column2],[Column3])

When a process attempts to access a securable object, the operating system compares the access token to first the DACL and then (if it is present) the SACL on the object. The comparison with the DACL focuses on three factors:

Okay, so you created and then enforced a relationship between the category and department tables. But how does it work, and how does it affect your life Let s study how you implemented this relationship. In the category table, apart from the primary key and the usual category_id, name, column, and description columns, you added a department_id column. This column stores the ID of the department the category belongs to. Because the department_id field in category doesn t allow NULLs, you must supply a department for each category. Furthermore, because of the foreign key relationship, the database won t allow you to specify a nonexistent department. The foreign key s behavior is dictated by the command used to create it, which in our case is CONSTRAINT fk_department_id FOREIGN KEY (department_id) REFERENCES department (department_id) ON UPDATE RESTRICT ON DELETE RESTRICT The constraint can be instructed to act differently on update and delete operations. Here, in both cases the behavior is RESTRICT. Let s see the alternatives:

If you express the cost of scanning n rows with a query as n, you can express the cost of scanning the same number of rows with a cursor as n + n o, where o represents the overhead, or extra cost, associated with the processing of a single cursor row You can eliminate the actual disk I/O cost by running the code twice (The first run will load the data to cache ) To eliminate the time it takes to generate the output, you should run your code with the Discard results after execution option in SQL Server Management Studio (SSMS) is turned on The difference in performance between the set-based code and the cursor code will then be the cursor s overhead I will now demonstrate how to compare scanning the same amount of data with set-based code versus with a cursor .

private static void Counter(Int32 from, Int32 to, Feedback fb) { for (Int32 val = from; val <= to; val++) { // If any callbacks are specified, call them if (fb != null) fb.Invoke(val); } }

The first phase (P1) is very tricky to grasp. You can see in the query that the PIVOT operator refers to two of the columns from D as input arguments (customerid and category). The first phase implicitly groups the rows from D based on all columns that weren't mentioned in PIVOT's inputs, as though there were a hidden GROUP BY there. In our case, only the city column wasn't mentioned anywhere in PIVOT's input arguments. So you get a group for each city (Madrid and Zion, in our case).

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Management lets you make multiple levels of mounted volumes, including ones that are recursive. You re well advised to mount volumes only at the root level of a drive. Trying to mount below that point can lead to confusion and make management and documentation dif cult. Also, verify with your backup vendor that mount points are fully supported by their application.

Note There s only one downside to continuing. SharePoint gives each new task a unique ID, including

By optical suppressing the links between the data points (Line Color: No line) By omitting a marker fill By setting drop lines (accessed via Chart Tools/Layout/Analysis/Lines

Run the following code to generate a table called T1, with a million rows, each containing slightly more than 200 bytes:.

all the PPTP and L2TP ports are configured to allow both remote access connections (inbound only) and demand-dial routing connections (inbound and outbound). To disable remote access connections and create a dedicated site-to-site VPN connection server, clear the Remote Access Connections (Inbound Only) check box from the properties of the WAN Miniport (PPTP) and WAN Miniport (L2TP) devices from the properties of the Ports object in the Routing And Remote Access snap-in. Alternatively, you can clear the Remote Access Server check box on the General tab on the properties of the VPN server.