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Now let s take a look at joins from a calculus perspective. Remember, calculus expressions tell us what we would like the resultant table to look like as opposed to how we get it. Let s start with the Cartesian product: we want a set of rows made up of combinations of rows from each of the contributing tables. Figure 3-4 shows how we can envisage this. We are looking at two tables, so we need two fingers to keep track of the rows. Finger m looks at each row of the Member table in turn. Currently it is pointing at row 3. For each row in the Member table, finger t will point to each row in the Type table.

One handy trick that can improve your photos, when used with care, is to use the Sharpen filter. This has the effect of adding definition to the image and reducing any slight blur caused by camera shake or poor focusing. To apply the Sharpen filter, right-click the image and select Filters Enhance Sharpen. As shown in Figure 18-8, a small preview window shows the effect of the sharpening on the image (you might need to use the scrollbars to move to an appropriate part of the image, or resize the preview by clicking and dragging the bottom-right corner). Clicking and dragging the slider at the bottom of the dialog box alters the severity of the sharpening effect. Too much sharpening can ruin a picture, so be careful. Try to use the effect subtly.

Using a GUI on a server can be a very sensitive subject for some people. Some system administrators feel that the GUI is merely a waste of system resources and that there is no need for it on a professional server. These people are basically right, but doing everything at the command line can be quite a chore if you have no Linux experience. Personally, I believe in freedom of choice. You want to use a graphical interface to get familiar with Ubuntu Server That s fine with me. However, if you are an experienced Linux server administrator and you don t want to waste system resources on a useless graphical interface, please skip ahead to the section Creating Backups. That s fine with me as well. Do you still hesitate whether or not to install a GUI If so, Table 3-1 lists some advantages and disadvantages for you to consider. Table 3-1. GUI Advantages and Disadvantages

Summary

In this chapter, you ve taken a look at working with images under Ubuntu. First you looked at the F-Spot photo manager tool. F-Spot lets you easily import pictures, catalog them, and make some adjustments. Then you learned how to edit your images by using GIMP, one of the best programs available for the task under any OS. As with most areas, we could have selected many more applications to cover such as Google s Picasa, digiKam, and gphoto2, but F-Spot and GIMP provide perfect tools for both users and uses across the spectrum.

Listing 3-5. Relational Calculus for Cartesian Product {m, t | Member(m), Type(t)}