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

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Regrettably, it often seems that specific object models are defined more by example than by rigor. Nonetheless, there are certainly characteristics that appear in so m a n y object models that I will dare to say that they are central to the definition of object orientation. 5 Dr. E. F. Codd, "A Relational Model of Data for Large Shared Data Banks," Communications of the ACM, Vol. 13, No. 6, June 1970, pp. 377-387. 4 The SQL Object Model 9 In 1989, several papers were produced in an effort to lay the groundwork for inserting object technology into the database world.

6. 6 ValidAttempt to Raise an IQ and to Compare a Shoe Size SELECT FROM WHERE name, CAST ( iq AS INTEGER ) + 20 demograph_peopl e CAST ( footsies AS INTEGER ) > 7 In SQL:1999, distinct types are made more powerful by allowing database designers to create user-defined comparisons, user-defined casts, and other sorts of user-defined functions based on the distinct types in the database. Such functions, if defined, provide at least part of the distinct type's semantics. It's beyond the scope of this book to go into that level of detail about distinct types, though; if you're interested in it, I urge you to acquire one of the SQL:1999 books that are (or soon will be) available.

5 Conforming to SQL:1999 Object Facilities 17 PKG006 contains a mere five features: 9 Feature S023, "Basic structured types," supplies the ability to define UDTs and their methods without a number of advanced features. 9 Feature S041, "Basic reference types," gives applications the ability to define and use references to instances of UDTs that appear in typed tables. 9 Feature S051, "Create table of type," provides the ability to create typed tables. 9 Feature $151, "Type predicate," allows an application to determine the precise type (in a type hierarchy) of an instance of some UDT.

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