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As Chris Date, a well-known guru in the professional database world (see Appendix E for references to some of the great books he wrote), said during one of his seminars, There are only three databases: employees and departments, orders and line items, and suppliers and shipments The cardinality of the case tables is deliberately kept low This enables you to check the results of your SQL commands manually, which is nice while you re learning to master the SQL language In general, checking your results manually is impossible in real information systems, due to the volume of data in such systems It is not the data volume or query response time that matters in this book What s important is the database structure complexity and SQL statement correctness By the way, the two case tables EMPLOYEES and DEPARTMENTS show a striking resemblance to good old SCOTTEMP and SCOTT.

Change the getImageForURL: method:

DEPT, two of the Oracle demo tables that have been shipped with Oracle pretty much from the very beginning..

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I used clear tape to cover different variations of the rubber pads on the bottoms of the feet to see if I could properly tune the robot to walk straight. I wanted to figure out the effects of taping each of the rubber pads, as well as combinations of them, and how or if this steered the robot. After I had the tape placed over the footpads I would start Robosapien in the corner of the rug (where the white masking tape markings are, see Figure 6-18), set it to walking, and then measure where the robot walked off the rug. I did at least 20 repeats of each test (over 500 walks in all), continuously keeping track of where the robot went out of bounds (see Figure 6-19).

5 6 0

-(UIImage *)getImageForURL:(NSURL *)url { /* * called by tableView:cellForRowAtIndexPath to get the image * from the imageDictionary for the row * If the image is not in the row kick off a FetchImageOperation * to get the image */ id object = [imageDictionary objectForKey:url]; if (object == nil) { // we don't have an image yet so store a temporary NSString object

Figure 6-19. Here s a page from the notes I took while attempting to tune Robosapien s walking ability.

At the end of 5, you saw an example of a PL/SQL stored function to count all employees per department (Section 5.8, Listing 5-31). In that chapter, I mentioned that this counting problem is not trivial to solve in standard SQL. In Listings 8-22, 8-23, and 8-24, you see that you should indeed be careful. You need an outer join, and you should make sure to specify the correct argument for the COUNT function to get correct results.

// for the url [imageDictionary setObject:@"F" forKey:url]; /* * create a block operation */ PLBlockOperation *fetchImageOp = [PLBlockOperation blockOperationWithBlock:^{ NSAutoreleasePool *localPool; @try { localPool = [[NSAutoreleasePool alloc] init]; // fetch the image NSData *imageData = [[NSData alloc] initWithContentsOfURL:url]; // create the image from the image data UIImage *image = [[UIImage alloc] initWithData:imageData]; // store the image and url in a dictionary to return NSDictionary *result = [[NSDictionary alloc] initWithObjectsAndKeys:image,@"image",url,@"url",nil]; [self performSelectorOnMainThread:@selector(storeImageForURL:) withObject:result waitUntilDone:NO]; [imageData release]; [image release]; [result release]; } @catch (NSException * e) { NSLog(@"error in block operation"); } @finally { [localPool release]; } }]; } else { // we have an object but need to determine what kind of object if (![object isKindOfClass:[UIImage class]]) { // object is not an image so set the object to nil object = nil; } } return object; }

Caution You should be careful with the COUNT function, especially if null values might cause problems

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