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By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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18 Chapter 1 Introduction to SQL:1999 9 Feature $231, "Structured type locators," assists in accessing UDT instances from host programs. 9 Feature $241, "Transform functions," supports syntax allowing type definers to define routines that transform values between UDTs and SQL's predefined data types. The menagerie of SQL products on the marketplace has shrunk in recent years, as the relational database industry consolidates. At the time that this volume was written, Informix Software had recently been purchased by IBM, further reducing the number of independent players.

In this section, I'll illustrate the concepts to set the stage for the more detailed discussion later in this chapter. In the narrow world of my music and video store, the notion of movie is quite important. In order to serve m y customers well, I plan to give m y users the ability to enquire about m a n y aspects of movies in which they are interestedmfor example, the names of cast members, the running time, and information about other films by the same director. I also very m u c h want to sell and rent videotapes and DVDs of movies to customers.

Every object has a type. 5. All objects of a particular type can receive the same messages. Looking at all of these statements about object models and languages, it's easy to see a theme. As we'll see, SQL's object model honors that theme, while adding its own spin where needed. " The use of the different terminology is historical and isn't significant to the definition of SQL's object model (although I note in passing that the name "abstract data type" was used for several years during the development of SQL:1999).

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