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

By C. J. Date

ISBN-10: 0201502097

ISBN-13: 9780201502091

From 1983 to 1986, the mythical physicist and instructor Richard Feynman gave a direction at Caltech referred to as “Potentialities and boundaries of Computing Machines.”Although the lectures are over ten years outdated, lots of the fabric is undying and provides a “Feynmanesque” evaluation of many usual and a few not-so-standard issues in computing device technological know-how. those contain computability, Turing machines (or as Feynman stated, “Mr. Turing’s machines”), details idea, 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 different exploration of the elemental obstacles of electronic computers.Feynman’s philosophy of studying and discovery comes via strongly in those lectures. He regularly issues out the advantages of being silly with recommendations and dealing out options to difficulties in your own-before the again of the publication 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 joys of it-then someday you’ll flip round and discovers that no-one truly did that one! And that’s how you can turn into a working laptop or computer scientist.”

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3 Discussion If a query produces many lines of output, normally they just scroll right off the top of the screen. [6] --pager=program tells mysql to use a specific program as your pager: [6] The --pager option is not available under Windows. % mysql --pager=/usr/bin/less --pager by itself tells mysql to use your default pager, as specified in your PAGER environment variable: % mysql --pager If your PAGER variable isn't set, you must either define it or use the first form of the command to specify a pager program explicitly.

To recall a statement that was entered on multiple lines, the editing procedure is a little trickier than for single-line statements. In this case, you must recall and reenter each successive line of the query in order. For example, if you've entered a two-line query that contains a mistake, press Up Arrow twice to recall the first line. Make any modifications necessary and press Return. Then press Up Arrow twice more to recall the second line. Modify it, press Return, and the query will execute.

1 Problem You want to save a value from a query so you can refer to it in a subsequent query. 2 Solution Use a SQL variable to store the value for later use. 6, you can assign a value returned by a SELECT statement to a variable, then refer to the variable later in your mysql session. This provides a way to save a result returned from one query, then refer to it later in other queries. The syntax for assigning a value to a SQL variable within a SELECT query is @var_name := value, where var_name is the variable name and value is a value that you're retrieving.

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