By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)
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Extra resources for advanced sql 1999
The value stored in that c o l u m n in each row of the table is an ADDRESS value or an INTEGER value, depending on the data type specified for the columnl Similarly, you can define parameters of SQL-invoked routines, SQL variables, and attributes of other UDTs to have data types that are user-defined types. But all of those uses of UDTs are as values and not as objects. 1, is object identity, the real-world characteristic that every entity is uniquely identifiable. In the context of an object-oriented p r o g r a m m i n g or database environment, that means that instances of abstract data types must have a unique identifier by which they can be referenced.
SQL/MM is, like SQL, a multipart standard. In SQL/MM's case, however, the various parts have little or no dependencies on one another. Instead, each part specifies a "type library" for a specific type of nontraditional data. Parts of SQL/MM currently available or nearing publication include FullText, Spatial, Still Image, and Data Mining. Finally, I end with a brief look at the future of SQL (and SQL/MM), trying to interpret the mist, chips, and cracks in my old crystal ball to give you something to which you can look forward!
The database through which I manage the store includes UDTs for both employees and customers. However, some of my employees are also customers, so the question naturally arises" How do I represent a single entity that is both a customer and an employee? Systems that support multiple inheritance would allow creation of a new UDT, say CUST_EMP,that inherits all attributes and methods of my CUSTOMERtype and all attributes and methods of my EMPLOYEE type. 1 illustrates the relationships of types in a type hierarchy when multiple inheritance is supported and when single inheritance is supported.