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In this chapter, you ve learned how to understand and, most importantly, visualize how SQL is processed internally, including joins, grouping, and aggregate functions You ve also learned how to leverage structured exception handling for routing ColdFusion application behavior based on database errors thrown when a user attempts a forbidden action Finally, you learned how to improve the performance of your ColdFusion application by caching database result sets in memory I sincerely hope this chapter has helped you better understand SQL as a descriptive language through the visualization examples that we ve given You can memorize syntax until you re blue in the face, but just as in any professional endeavor, if you can t feel it, you can t perfect it Always visualize relational result sets as a series of simple two-table joins and your types of joins as Venn diagrams.

where N is the length of the signal y[i] for i = 0, 1, , (N |m| 1) For the AC/DCT method, y[i] is the autocorrelated ECG obtained from Eq (161) G[u] is given by 1, k = 0, N (163) G(k) = 2 , 1 k N 1 N Due to the energy compaction property of DCT, a lower-dimension representation is obtained Near-zero frequency components of the spectrum can be discarded Assuming we take an M-point DCT of the autocorrelated signal, only C << M nonzero DCT coef cients will contain signi cant information for identi cation From a frequency domain perspective, the C nonzero coef cients correspond to the frequencies between the cutoffs of the bandpass lter that is used in preprocessing This is because after the AC operation, the bandwidth of the signal is kept.

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If you picture the intermediate work product of each clause of your SQL statement as it is produced and then fed to the next clause in the processing order of precedence, you can never get lost again Similarly, listen to the English-language version of your SQL statement and ask yourself whether it makes sense Are you asking for two different things of different dimensions in the same statement If so, your statement always fails because the question isn t possible to answer Remember that GROUP BY conceptually produces an invisible third dimension containing the constituent rows that make up each group and that aggregate functions operate over each individual group rather than the entire set of data.

If you design your database by using all of the principles taught in the earlier chapters, plus what you learn in s 10 and 11, you can expect your database to throw errors whenever users attempt to violate the rules that you built into it Knowing where to catch these database errors in your application and how to handle them simply as exceptions to normal workflow makes your ColdFusion code smaller, easier to write, and more manageable Finally, find the places where data doesn t need to be live all the time, but can lag for a few hours or days before being refreshed, and turn these segments into cached queries..

The DCT coef cients retain the discriminative properties of the AC samples among different subjects as depicted in Figure 165 The re ned feature space is propagated to the classi cation step, where every compressed input DCT vector is compared to the ones stored in the gallery set Linear Discriminant Analysis for Dimensionality Reduction Another option to reduce the dimensionality of the feature space is the linear discriminant analysis (LDA) Supervised learning is carried out in the transformed domain, so that eventually feature dimensionality is reduced and the classes are better distinguished This scheme is referred to as AC/LDA Given a training set Z = {Zi }U , with U classes, where each class Zi = {zij }Ui i=1 j=1 contains a number of autocorrelated windows zij , a set of K feature basis vectors { m }K can be estimated by maximizing Fisher s ratio.

As this page is processed, what s sent to the browser is still the same form that appears in Figure 20-1. It really doesn t appear any differently at all. ColdFusion changes the CFFORM into a FORM tag and the CFINPUT into corresponding INPUT tags and adds some JavaScript code to perform any requested validation. But, of course, if you haven t yet requested any validation, to using the CFFORM and CFINPUT tags is not logical. As you step toward understanding the feature, however, understanding this characteristic is useful.

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