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We didn t specify any value for the Description field because it was marked to allow NULLs in the Department table. This is why you can omit specifying a value, if you want to. (You can





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Open SQL Server 2005 Management Studio and issue the SELECT statement shown in Listing 10-1. Listing 10-1. Using the AUTO Mode of the FOR XML Clause SELECT EMPLOYEEID,FIRSTNAME,LASTNAME FROM EMPLOYEES FOR XML AUTO <EMPLOYEES EMPLOYEEID="1" FIRSTNAME="Nancy" LASTNAME="Davolio"/> <EMPLOYEES EMPLOYEEID="2" FIRSTNAME="Andrew" LASTNAME="Fuller"/> <EMPLOYEES EMPLOYEEID="3" FIRSTNAME="Janet" LASTNAME="Leverling"/> .... The SELECT statement from Listing 10-1 selects three columns EmployeeID, FirstName, and LastName from the Employees table. Listing 10-1 also shows the returned data in XML format. Notice how the table name is used for the XML element names (<EMPLOYEES>), and column names are used for attribute names. Have you noticed something about the character casing of the returned XML It depends totally on the table name and columns used in the SELECT statement. For example, if you specify column names in uppercase, the XML attributes will be in uppercase. You may need to keep this in mind while parsing the XML data in your application. By default the AUTO mode returns all the column values as XML attributes. If you wish, you can return them as elements instead. This is achieved by using the ELEMENTS clause with the AUTO mode. Listing 10-2 shows how the ELEMENTS clause works. Listing 10-2. Using the ELEMENTS Clause of the AUTO Mode SELECT EMPLOYEEID,FIRSTNAME,LASTNAME FROM EMPLOYEES FOR XML AUTO,ELEMENTS <EMPLOYEES> <EMPLOYEEID>1</EMPLOYEEID> <FIRSTNAME>Nancy</FIRSTNAME> <LASTNAME>Davolio</LASTNAME> </EMPLOYEES> .... As you can see, we specify the ELEMENTS clause after the AUTO mode. Notice how the column values are returned as elements this time. The names of the elements are the same as the column names.





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Universal Product Code - Wikipedia
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.

also omit specifying values for columns that have default values defined.) However, the Name field is required, so if you tried, for example, to specify a description without specifying a name, you would get an error: INSERT INTO Department (Description) VALUES ('Some Description Here') The error message specifies .Net SqlClient Data Provider: Msg 515, Level 16, State 2, Line 1 Cannot insert the value NULL into column 'Name', table 'balloonshop.dbo.Department'; column does not allow nulls. INSERT fails. The statement has been terminated. Also note that you didn t specify a DepartmentID. Because DepartmentID was set as an identity column, you re not allowed to manually specify values for this column. SQL Server can guarantee this has unique values, but only if you don t interfere with it. So, if you can t specify a value for DepartmentID, how can you determine which value was automatically supplied by SQL Server For this, you have a special variable named @@IDENTITY. You can type its value by using the SELECT statement. The following two SQL commands add a new record to Department and return the DepartmentID of the row just added: INSERT INTO Department (Name) Values ('Some New Department') SELECT @@IDENTITY

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Net is a port of ZXing, an open-source, multi-format 1D/2D barcode image processing library ... With the Barcode Reader SDK, you can decode barcodes from.

XML clause in the preceding code is not well formed by default. It doesn t include the root element. However, as you will see later, you can specify the root element yourself.

The UPDATE statement is used to modify existing data and has the following syntax: UPDATE <table name> SET <column name> = <new value> [, <column name> = <new value> ...] [WHERE <restrictive condition>] The following query changes the name of the department with the ID of 43 to Cool Department. If there were more departments with that ID, all of them would be modified, but because DepartmentID is the primary key, you can t have more departments with the same ID. UPDATE Department SET Name='Cool Department' WHERE DepartmentID = 43 Be careful with the UPDATE statement, because it makes it easy to mess up an entire table. If the WHERE clause is omitted, the change is applied to every record of the table, which you usually don t want to happen. SQL Server will be happy to change all your records, without any warning; even if all departments in the table would have the same name and description, they would still be perceived as different entities because they have DepartmentIDs.

The syntax of the DELETE command is actually very simple: DELETE [FROM] <table name> [WHERE <restrictive condition>]













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