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Null values in SQL often cause trouble. You must be aware of their existence in the database and their odds of being generated by Oracle in (intermediate) results, and you must continuously ask yourself how you want them to be treated in the processing of your SQL statements. Otherwise, the correctness of your queries will be debatable, to say the least. You have already seen that null values in expressions generally cause those expressions to produce a null value. In the next chapter, you will learn how the various SQL functions handle null values. It is obvious that there are many pitfalls in the area of missing information. It may be possible to circumvent at least some of these problems by properly designing your databases. In one of his books, Ted Codd, the inventor of the relational model, even proposed introducing two types of null values: applicable and inapplicable. This would imply the need for a four-valued logic (see Ted Codd, 1990).

Note If you have SSH keys set up (see recipe 6-1), you can use this:

Before moving the tilemap, the isTilePosBlocked method is called to see if the player can actually move there. If the destination tile coordinate is not blocked, he will move, otherwise he won t.

If you are interested in more details about the trouble of null values (or other theoretical information Tip

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So far, we have a game where you guide a character through an isometric tilemap world. Hiding behind trees and avoiding collisions are just the foundation for a game set in this world. What if you want to add more actors to the world, whether enemies or non-player characters (NPCs) In principle, you animate them just like you d move the player, except that the player is centered on screen whereas NPCs can be anywhere on the tilemap. Still, you only need to determine which direction the NPC should walk toward, and then move him like the layer is moved in the centerTileMapOnTileCoord method. The only difference is that the

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about relational databases and pitfalls in SQL), the books written by Chris Date are the best starting point for further exploration. In particular, his Selected Writings series is brilliant. Chris Date s ability to write in an understandable, entertaining, and fascinating way about these topics far exceeds others in the field.

CAUTION: If you manually rotate some images and then click the Apply button in the Layout pane with Allow Rotation checked, you may lose those sprites rotations. The same goes for the trimming of images. After you added and laid out the ship animation images from the Sprites06 project s Resources folder, you may have noticed that the images do not align. Zwoptex removes any excess transparent borders from images to make them as small as possible to save space in the Texture Atlas. Don t worry, cocos2d will take this offset into account and display these trimmed images at the correct positions.

Here s a brain-twister to finish this section about null values: why does the query in Listing 4-44 produce no rows selected There are registrations with evaluation values 4 and 5, for sure. . . Listing 4-44. A Brain-Twister SQL> select * from registrations 2 where evaluation not in (1,2,3,NULL); no rows selected SQL> This problem is left as an exercise at the end of this chapter.

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In case you are wondering about the Padding setting, it determines how many pixels of space is left between all images. The default of 2 pixels ensures that all the images in the Texture Atlas can be drawn without any artifacts. With less padding, images can show stray pixels around their borders when they are displayed in your game. The amount and color of these stray pixels depends on surrounding pixels from other images in the Texture Atlas. This is a technical issue that has to do with how the graphics hardware filters textures, and the only solution is to leave a certain amount of padding between all images in a Texture Atlas. After you ve done a quick initial layout of the images, you ll be able to see approximately how much space in the Texture Atlas is still unused. You can then add more images, since your goal should be to create as few Texture Atlases as possible with the most images and the least amount of wasted space. But if you have only a few images, the next best option should be to reduce the texture size (or canvas, in Zwoptex terms). When you are done creating your Texture Atlas and all images fit without overlap, you should save it by selecting File Save. This will save the Zwoptex settings in a ZSS file. Then click the Publish button, and Zwoptex will create the .png and .plist files, which are needed for cocos2d in the same folder as the ZSS file.

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