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9 Feature S081, "Subtables," increases the power of Feature S051 by allowing typed tables to be arranged into a table hierarchy analogous to the type hierarchy of the associated UDTs. 9 Feature $111, "ONLY in query expressions," gives applications the ability to retrieve only instances of a specific type and not instances of any of its subtypes. 9 Feature $161, "Subtype treatment," provides the capability to instruct the SQL environment to assume that the value of some UDT instance is actually an instance of a specific subtype.

In spite of that detail, both companies' products do support significant, although somewhat different, subsets of the features in those packages. It appears to me that Oracle's support has emphasized the use of structured user-defined types as rows of typed tables, while IBM's tends more toward the use of those UDTs as the types of columns in ordinary tables. Both directions are obviously useful and I would not be at all surprised to see both vendors enhancing their products by including the missing features.

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. For example, the movie and video store that forms the basis of my sample application has several employees; naturally (if I am to remain in business), it also has customers.

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advanced sql 1999 by understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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