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

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

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Now, by "behaviors," I mean actions that are performed by the systemmin the case of SQL:1999 types, this will naturally be the SQL systemmthat either change the state of some type instance, return some value derived from the state of some type instance, or perform some other action involving the type or an instance of it. " There are no limits to what these behaviors can be, other than those set by the environm e n t in which you're operating. A type designer typically determines the behaviors supported by, or available to, the types being defined, but some systems permit applications to add new behaviors to existing types.

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.

Here's a working definition: A user-defined type is a type that is not built into a database system or programming language, but that can be defined as part of an application development effort, often (but not always) with behaviors provided by its definition. H m m m . . " Right! As will be seen later in this chapter, SQL's user-defined type capabilities allow an application (or a database) to define a new type that is identical in most respects to some existing, built-in type. 1. As you'll see, these types--called distinct typesmare permitted, but not required, to have user-defined behaviors, which distinguishes them from the other category of user-defined typesmstructured types~that have only user-defined behaviors.

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