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For the examples mentioned so far in this chapter, you could argue that you could implement them very well with standard relational techniques, as discussed in previous chapters of this book. You could separate various phone numbers into separate columns, you could create a separate ERRATA table with a foreign key constraint referring to the COURSES table, and so on. So when should you choose an object-relational approach rather than a pure relational approach It might be a matter of taste, and discussions about taste are probably a waste of time in a technical book like this one. As the Romans said, De gustibus non disputandum est... 1 It might be the case that you have a powerful object-oriented design and development environment. You may find that Oracle s object-relational features enable you to maintain an intuitive and straightforward mapping between that development environment and the Oracle database structures. In any case, this book does not speculate about when one approach is better than the other. The examples in this chapter have a single purpose: to illustrate the object-relational features of the Oracle DBMS. As you read about the techniques described in this chapter, you may wonder whether they violate the first normal form as one of the foundations of the relational model. That is not the case. The relational model does not forbid in any way storing complex or set-valued attributes in your rows. Data atomicity is a rather slippery concept. For example, if you consider DATE values, aren t you looking at a compound datatype A DATE value has meaningful subcomponents, such as year, month, and day. For a thorough treatment of this subject, see An Introduction to Database Systems (8th Edition), by Chris Date.

TABLE 16-3 Differential Diagnosis of Rosacea Benign cutaneous ushing Allergic contact dermatitis Lupus erythematosus Dermatomyositis Mixed connective tissue disease Carcinoid syndrome Pheochromocytoma Medullary carcinoma of the thyroid Pancreatic cell tumor (VIPoma) Mastocytosis Photosensitivity from medications Climacterium/postmenopausal

FIGURE 7-2

We will begin to explore varrays by implementing the phone list example introduced in the previous section. To keep our EMPLOYEES table unimpaired, we create a copy of the EMPLOYEES table for our experiments in this final chapter of the book. We also leave out some of the columns of the original EMPLOYEES table. See Listing 12-1. Listing 12-1. Creating a Copy of the EMPLOYEES Table SQL> 2 3 4 create table e as select empno, ename, init, mgr, deptno from employees;

Before we can add a list of phone numbers for every employee in the E table, we must create a corresponding type first, as shown in Listing 12-2.

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FIGURE 16-3 Phymatous rosacea Thickened, irregular skin on the nose This individual exhibits the papulopustular form of rosacea as well

CHAPTER 7:

Listing 12-2. Creating and Describing a Type SQL> create or replace type numberlist_t 2 as varray(4) of varchar2(20); 3 / Type created. SQL> describe numberlist_t numberlist_t VARRAY(4) OF VARCHAR2(20) SQL> select type_name, typecode 2 from user_types; TYPE_NAME TYPECODE ------------------------ -----------------------------NUMBERLIST_T COLLECTION SQL> Note that you must end the CREATE TYPE command in Listing 12-2 with a slash (/) in the third line, although you ended the second line with a semicolon. The reason is that you are not entering an SQL or an SQL*Plus command; you re entering a PL/SQL command. Note also that from now on, you can use this NUMBERLIST_T type as often as you like. It is known to the database, and its definition is stored in the data dictionary. You can query the USER_TYPES data dictionary view to see your own type definitions.

Sometimes this simple and very basic way of storyboarding is the best It allows you to do certain things that the more sophisticated methods might overlook The most important thing it does is force you to simplify You already have enough to worry about with the setup and actually filming of the video You don t need to waste your valuable time doing accurate illustrations of each shot Again, I can t emphasize enough that this is a simplification exercise It will help you focus on what s essential in your story, and what isn t necessary at all When shooting, this focus will help you to set up shots so that you know what to get from each shot All of us have seen the depiction of the movie-making set where they shoot a number of takes until they get it right As though what the director wants is a mystery, they shoot again and again until she says, We got it, check the gates What you didn t realize is that, before this moment, to know what she needed to get, the director developed her storyboards And she probably had them on hand while shooting Of course, she also had a budget, and so she worked with storyboard artists and assistants when she developed hers Not so with us We re on our own The bare structure and realization of our storyboard can work as a final product, and we can use it right now to begin shooting Or we can use it as yet another starting point, a refining agent for our video

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