An introduction to categories in computing by Jay C.B.

By Jay C.B.

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INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT . . 6); You can create the database using the following command: mysql -u your_username -p your_mysql_password As you can see from Listing 3-3, the schema in this example is quite similar to the previous schemas, except that it gives a bit more information. Each time a game is played, there is an entry in the plays table. Every time a major game event happens, there is a row in the events table. This allows you to analyze the average time it takes the player to achieve each goal.

Fortunately, graphing is a very common task, and several graphing utilities are available. This chapter introduces a few of these utilities, and then demonstrates how to build charts with Gruff, a powerful Ruby-based graphing library. Choosing a Graphing Utility You have many choices for creating charts with Ruby. For example, you can do simple charting in straight Hypertext Markup Language (HTML) and Cascading Style Sheets (CSS). Chapter 7 shows you how to use Markaby, a templating language for Ruby, to create your own HTML bar charts.

25f' % call formats the value as a float # with two decimal points. The String's % operator works # similarly to the C sprintf function. rb. 00 Count 1 4 1 1 As you can see, it’s reasonably trivial to use the calculate function to do simple grouping and report the results. Dissecting the Code Most of Listing 2-2 is code to connect to the database and initialize the models, as you’ve seen in other examples. 2f' % salary}\t#{count} " end Essentially, this code groups by the salary field and counts the ids in each group.

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