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As a final example of recursion in practice, let s have a look at the algorithm called binary search. You probably know of the game where you are supposed to guess what someone is thinking about by asking 20 yes-or-no questions. To make the most of your questions, you try to cut the number of possibilities in (more or less) half. For example, if you know the subject is a person, you might ask Are you thinking of a woman You don t start by asking Are you thinking of John Cleese unless you have a very strong hunch. A version of this game for those more

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This SQL retrieves rows with an id column equal to 2 from the people table (usually, because id is a column containing unique values, only one row would be returned for such a query):

This SQL retrieves any rows that have a name column equal to Chris Scott :

Your single storyboard helps you manage your spoken words, projected visuals, and printed handouts. Follow these three ground rules to ensure that the rest of the live presentation experience is engaging: Rule 1: Step into the screen. Rule 2: Remove the distractions. Rule 3: Manage the ow.

SELECT * FROM people WHERE name = "Chris Scott"

This SQL retrieves all rows of people whose ages are between 20 and 40 inclusive:

Up to now, this book has concentrated on helping you to prepare a PowerPoint le that minimizes distractions that would otherwise overload the limited capacity of the working memory of your audience. You remove unnecessary information from the presentation by narrowing the focus of the story template. You keep extraneous information out of the slide area by following the storyboard and design ground rules. And you keep both graphics and words focused on the headlines. Now that you ve removed distractions from the PowerPoint le, it s time to focus on removing distractions from the environment in which you ll present.

numerically inclined is to guess a number For example, your partner is thinking of a number between 1 and 100, and you have to guess which one it is Of course, you could do it in a hundred guesses, but how many do you really need As it turns out, you only need seven questions The first one is something like Is the number greater than 50 If it is, then you ask Is it greater than 75 You keep halving the interval until you find the number You can do this without much thought The same tactic can be used in many different contexts One common problem is to find out whether a number is to be found in a (sorted) sequence, and even to find out where it is.

The conditions used in SQL are somewhat similar to those used in Ruby and other programming languages, except that logical operators such as AND and OR are written as plain English. Also, as in Ruby, you can use parentheses to group expressions and build up more complex requests. It s also possible to have the results returned in a certain order by appending an ORDER BY clause such as ORDER column_name to the SQL query. You can further append ASC to the column name to sort in an ascending fashion, or DESC to sort in a descending fashion. For example, this SQL returns all rows from the people table ordered by the name column in descending order (so names starting with Z come before those beginning with A):

This SQL returns all rows of those people between the ages of 20 and 40 in order of age, youngest first: