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The basic and most important SQL commands are SELECT, INSERT, UPDATE, and DELETE. Their names are self-explanatory, and they allow you to perform basic operations on the database. You can use SQL Server Management Studio Express to test these commands with your newly created Department table. Start SQL Server Management Studio Express, log in to your local SQL Server Express instance (by default, named localhost\SqlExpress), and then execute the following command, which connects you to the BalloonShop database. (To execute the command, click New Query to open a new query window, type the command you want to execute, and finally use the Execute button on the toolbar. Alternatively, choose Query Execute, or press the F5 shortcut key.) USE BalloonShop After executing this command, you should get a Command(s) completed successfully message. After you connect to the database, you re ready to test the SQL commands you re about to learn. Be aware that each SQL command has many optional arguments, and they can become more complex than those presented here. Still, to keep the presentation short and simple, you ll learn the most important and frequently used parameters, and we ll get into more details later in the book.

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To fetch FOR XML clause SQL Server data in XML format, you need to use the FOR XML clause with the SELECT statement. The FOR XML clause has four modes that allow you to return the XML results in different formats. The modes of the FOR XML clause are listed in Table 10-1.

The SELECT statement is used to query the database and retrieve selected data that match the criteria you specify. Its basic structure is SELECT <column list> FROM <table name(s)> [WHERE <restrictive condition>]

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The Universal Product Code ( UPC ) (redundantly: UPC code) is a barcode symbology that is .... read UPC -like labels with his ring wand. In addition to reading regular labels, he read the large two-page centerfold label in the proposal booklet.

The AUTO mode returns the results of the SELECT query as XML fragments. By default it returns the data as XML elements. The name of the XML element is the same as the table name, and column values are returned as XML attributes. You have the option to return all the columns as elements instead of attributes. The RAW mode returns the results as a <row> element. The column values are returned as XML attributes. The PATH mode allows you to define the nesting of the returned XML by using simple XPath syntax. The EXPLICIT mode defines a schema for the returned results explicitly in the SELECT query.

11. Go to the Footer area and click Add a Gadget. 12. In Title enter <!--background--> (it will not appear on your blog), and paste the code into the Content box. 13. Click Save. 14. View your blog (see Figure 7-2). 15. To remove the background and bring your blog back to the original layout, remove the gadget you just added. 16. Click Save and view blog.

Note Although SQL is not case sensitive, in this book the SQL commands and queries appear in uppercase

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The simplest SELECT command you can execute on your BalloonShop database is SELECT * FROM Department If you ve created and populated the Department table as described in the exercises, you should get the results shown in Figure 4-12. The * wildcard you used in the SQL query means all columns. Most of the time, unless you have a serious reason to use it, it s good to avoid using this wildcard, instead specifying the columns you want returned manually, like this: SELECT DepartmentID, Name, Description FROM Department

To test these modes of the FOR XML clause, you will execute some SELECT queries against the famous Northwind database by using the SQL Server 2005 Management Studio, shown in Figure 10-1.

Figure 4-12. Executing a simple SQL command using SQL Server Management Studio The following command returns the name of the department that has the DepartmentID of 1. In your case, the returned value is "Anniversary Balloons", but you would receive no results if there were no departments with an ID of 1. SELECT Name FROM Department WHERE DepartmentID = 1

Note To work with the examples discussed in this chapter, you need to have SQL Server 2005 or SQL Server 2005 Express Edition, SQL Server 2005 Management Studio, and SQLXML managed classes installed on your machine.

The INSERT statement is used to insert or add a row of data into the table. Its syntax is as follows: INSERT [INTO] <table name> (column list) VALUES (column values) The following INSERT statement adds a department named Mysterious Department to the Department table: INSERT INTO Department (Name) VALUES ('Mysterious Department')

Because it is easy to install new backgrounds, try experimenting with a few until you find one you like. If you find one you like but do not like that the middle is not white, you can add this code to the outer wrapper area: background: #FFFFFF. You will learn how to modify CSS code like this later in this chapter in the Convert to a Three-Column Format exercise.

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