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As I pointed out in the previous section, not all versions of SQL are the same. In 1992 keywords representing some algebra operations were added to the SQL standard,1 and there have been a number of updates since then. However, not all vendors incorporate all parts of the standard, and some add extras. You might find that some SQL versions may not implement all the algebra-related keywords that we use in this book, but there are usually a number of ways to retrieve the information required. You can express all the relational algebra operations using relational calculus expressions, and they will always work for you. In the meantime, let s look at the SQL statements that reflect the algebra operations. We ll look at other equivalent calculus statements later in this chapter. The SQL key phrase for a Cartesian product is CROSS JOIN. It is not often that you have a question that requires a CROSS JOIN, but for completeness Listing 3-3 shows it being used to retrieve the table shown in Figure 3-3a. As in all our other SQL queries, SELECT * just means retrieve all the columns. java qr code scanner download node-qrcode +2 qr code generator - Best of JavaScript
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Scan and write your QR codes using this app ** ... QR code scanner Antidote Inc. 3.0. Download · More. Application description. **Scan and write your QR codes ... Tip To create vector artwork, a better choice is a program like Inkscape (www.inkscape.org), which can be downloaded via the Ubuntu Software Center (to learn about software installation, see 20). Beneath the menu bar in the main toolbar window are the tools for working with images. Their functions are described in Table 18-1, which lists the tools in order from left to right, starting at the top left. scan qr code java app How to Create a QR Code SVG Using Zxing and JFreeSVG in Java ...
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Found 2 Free Qr Code Reader Nokia E63 Java Apps. Download Nokia E63 Java Apps for free to your S60 phone or tablet. Why not share and showcase your ... R: Reinstallation of the package is required. X: The package requires reinstallation and has been put on hold. The dpkg command can be used to show a list of packages that are already installed in your system, but you can also use it to display a list of packages that are available to your system. The only difference is that you have to provide some information about the package. For example, the command dpkg -l "samba*" would provide information about the current installation status of the Samba package. Listing 3-3 shows the result of this command. Listing 3-3. Dpkg Can Be Used to Display a List of Packages That Are Available. sander@RNA:~$ dpkg -l "samba*" Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err =(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-==============-==============-============================================ un samba-common <none> (no description available) As you can see in the output that is provided for each package, the first two positions show that the package status is currently unknown. In combination with some smart use of the grep command, you can even use this construction to find out what packages are available for installation on your server. In the command dpkg -l "*" | grep ^un, the grep command is used to filter out all packages that show a result that starts with the letters un, which is very typical for a package that is not installed. You can also use the dpkg utility to find out what package owns a certain file. This is very useful information. Imagine that a file is broken and you need to refresh the package s installation. To find out what package owns a file, use dpkg --seach /your/file. The command will immediately return the name of the package that owns this file. java qr code scanner library Javascript vCard generator with QR code - JSFiddle
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This library has been written to generate a SVG image of QR Code in Node.js, goals: pure JavaScript. no browser requirement. no external dependencies. generate SVG output.
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