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4 we will discuss the WITH clause, also referred to as subquery factoring, which allows you to define one or more subqueries in the beginning of your SQL commands, and then to reference them by name in the remainder of your SQL command We continue with hierarchical queries Relational tables are essentially flat structures, but they can represent hierarchical data structures; for example, by using foreign key constraints referring to the primary key of the same table The MGR column of the EMPLOYEES table is a classic example of such a hierarchical relationship Oracle SQL supports explicit syntax to simplify retrieval of hierarchical data structures The next subject we investigate is windowing Within the context of a single row (or tuple variable), you can define a dependent window of rows, with an optional ordering within that window.

Start by looking over the anchors that came as part of your Robosapien s packaging. In older robots, these were made of thick, black plastic. Newer models seem to have lighter-grade plastic anchors that are much easier to work with. Pick a nice clean, undamaged anchor and pull off any glue that is still stuck to the anchor. Using the following picture as a guide, take your scissors and try to approximate the shape of the claw shown here. The top example shows a finished claw attachment; the bottom example shows one in progress.

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Early on, I decided to aim for a high-performance render engine, as this will give my projects a leg up compared to games created with other engines. This decision had two consequences: one, my engine is programmed in C++ and two, I ve started to create my own tools. C++ allows me not only to structure the code in a modular way, but also to program to the bare metal when needed. In contrast to Objective-C, which I still use for APIs specific to the iPhone, C++ allows you fine-grained control over memory and performance trade offs. Using C++ in combination with OpenGL also makes it easy to port my engine, should I decide to create a game for a platform other than the iPhone. Good render performance requires more than just the right choice of programming language. There s a lot of optimizations you can do to your game data to suit the target platform. Tools and engine code goes hand in hand because the output of the former is the input to the latter.

Once you have defined such windows, you can apply various powerful analytical functions to derive aggregate information about the rows in that window Finally, this chapter discusses a helpful Oracle SQL feature allowing you to travel back in time: flashback queries The chapter ends with some exercises..

The idea is to write tools that optimize game data offline, on a desktop computer, where computational power is not an issue. The render engine on the iPhone, on the other hand, should be as simple as possible. In the best case, the engine would just pass data through to OpenGL, without any additional steps involved. The process of transforming your data into an efficient game format isn t without its problems. The additional step required before you can use a new asset in your game takes time and adds complexity. Fortunately, the number of art assets used in iPhone games is fairly low, so it never takes more than a few minutes to process the data. (That s in contrast to console games, where I have seen this step take several days because of the high number of art assets involved.) Another disadvantage is that it takes a lot of time to write tools. If you are like me, you d rather spend your time writing code for a fancy graphics effect. However, having my own tools allows me to innovate on technology. For example, I could optimize my game data for a new hardware platform or take advantage of a new graphics effect that requires the game data in a special way fairly quickly.

4 discussed various examples of subqueries, using the IN operator or standard logical comparison operators. As a refresher, let s start with two standard subquery examples. The subquery in Listing 9-1 shows all 13 registrations we have for build courses; that is, for course category 'BLD'.

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