advanced sql 1999 by understanding object-relational, other advanced features (j.

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

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SQL/Framework defines inheritance in the following manner: "A structured type may be defined to be a subtype of another structured type, known as its direct supertype. " Although that definition doesn't cite behaviors explicitly, SQL:1999's inheritance includes more than attributesmmethods of supertypes are also inherited by subtypes. Many object-oriented systems permit attributes and methods to be inherited from multiple supertypes; systems with this capability are said to support multiple inheritance.

Based on this belief, it is possible that future generations of the SQL standard may first deprecate and then delete domains entirely, in spite of the existence of users who take advantage of domains' macro-like behaviors. 2 29 Structured UDTs as Values As indicated earlier, the other sort of user-defined type supported in SQL:1999 is the structured type; you should infer from its name that values of such types are permitted to h a v e - - a n d usually do have--internal structure to them. For example, a structured type n a m e d address might contain several components: number, street_name, apartment_number, city, state_or_region, country, and postal_code.

Most programmers are intimately familiar with polymorphism, even if they don't apply that word to describe the concept: If you've ever programmed in a language that allows you to add two integers using the familiar + operator and allows you to add two floating point numbers using that same operator, then you've already experienced the benefits of polymorphism. In this case, the + operator provides different (although conceptually similar) functions based on the data types of its arguments; for example, an integer addition usually makes use of different hardware circuitry than a floating point addition.

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