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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2 What Are UDTs? 23 items in a single cell (a name I use to describe the intersection of a column and a row, even though the SQL standard has no word for that concept) of a table, the database systems rarely supported any operations, including comparisons, on such data. If any operations were supported, they tended to be simple ones such as substring, concatenation, and basic comparisons (often limited to equality and inequality). In other words, the semantics of the data stored in such cells were not handled by the database system; they were left to the applications to tackle.

One of these 6 proposed that true object-oriented programming language capabilities should form the foundation for creation of object-oriented database systems. Another 7 proposed the addition of extension to relational systems that provided better support for userdefined types and complex data structures. A third 8 argued for retaining the relational aspects of SQL, but extending its type system to include complex types. SQL's relational model includes m a n y of the ideas taken from all of those papers.

Unlike m a n y other such systems, however, SQL:1999 allows type designers to provide the behaviors of its user-defined types through routines written in any of several languages, not only in SQL. " The terminology used in discussing objects and object models gets a bit confusing at times; this appears to be due to the use of different vocabularies to describe different object models. , an application "sends a message" to an object and the object acts on that message), while other object models, including SQL:1999's, describe the same event by saying that an application "invokes a routine" and specifies the target object's identity as part of that invocation--so it's the routine that is active and the object is passive.

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