A guide to the SQL standard : a user's guide to the standard by C. J. Date

By C. J. Date

From 1983 to 1986, the mythical physicist and instructor Richard Feynman gave a path at Caltech referred to as “Potentialities and boundaries of Computing Machines.”Although the lectures are over ten years previous, lots of the fabric is undying and provides a “Feynmanesque” review of many typical and a few not-so-standard issues in machine technological know-how. those comprise computability, Turing machines (or as Feynman stated, “Mr. Turing’s machines”), details conception, Shannon’s Theorem, reversible computation, the thermodynamics of computation, the quantum limits to computation, and the physics of VLSI units. Taken jointly, those lectures symbolize a distinct exploration of the basic obstacles of electronic computers.Feynman’s philosophy of studying and discovery comes via strongly in those lectures. He always issues out the advantages of fooling around with recommendations and dealing out strategies to difficulties in your own-before the again of the e-book for the solutions. As Feynman says within the lectures: “If you retain proving stuff that others have performed, getting self assurance, expanding complexities of your solutions-for the thrill of it-then sooner or later you’ll flip round and discovers that no-one really did that one! And that’s easy methods to turn into a working laptop or computer scientist.”

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Ini You may now delete the directory from which you compiled PHP—it’s no longer needed. ini shortly. For now, we need to tweak Apache’s configuration to make it more PHP-friendly. conf configuration file (usually under /etc/apache/ or /etc/httpd/ if you’re using your Linux distribution’s copy of Apache) in your favorite text editor. Next, look for the line that begins with DirectoryIndex. conf. This line tells Apache which file names to use when it looks for the default page for a given directory.

The % signs indicate that the word “chicken” may be preceded and/or followed by any string of text. Additional conditions may also be combined in the WHERE clause to further restrict results. For example, to display knock-knock jokes from April 2004 only, we could use the following query: mysql>SELECT joketext FROM joke WHERE ->joketext LIKE "%knock%" AND ->jokedate >= "2004-04-01" AND ->jokedate < "2004-05-01"; Enter a few more jokes into the table and experiment with SELECT statements. A good familiarity with the SELECT statement will come in handy later in this book.

It’s important to realize that MySQL, just like a Web server or an FTP server, can be accessed from any computer on the same network. If you’re working on a computer connected to the Internet, then, depending on your security measures, that means anyone in the world could try to connect to your MySQL server! The need to pick a hard-to-guess password should be immediately obvious! To set a root password for MySQL, open a command prompt (or Terminal window) and type the following command in the bin directory of your MySQL installation: mysql -u root mysql This command connects you to your newly-installed MySQL server as the root user, and chooses the mysql database.

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