By Jim Melton
Complicated SQL:1999 - knowing Object-Relational and different complicated positive factors is the practitioner's instruction manual to the standard's complicated gains. it isn't a re-presentation of the traditional, yet particularly an authoritative, in-depth consultant to its functional program. Like its spouse, SQL:1999 - figuring out Relational Language elements, which defined the standard's easy good points, this booklet will help you make your purposes either powerful and standard-compliant.This convenient reference has a modular structure so that you can discover particular issues very easily. it truly is both helpful to these upgrading from previous types of SQL and people with out earlier adventure. Written via the standard's extraordinary editor, complicated SQL:1999 will whole your wisdom and aid your abilities like no different booklet can. * Focuses fullyyt at the concerns that topic to programmers who're connecting purposes to databases.* information SQL:1999's item amenities, together with based user-defined kinds, typed tables, user-defined exercises, and regimen invocation.* Examines amenities new to SQL, together with these in relation to online analytical processing (OLAP), administration of exterior information (SQL/MED), and Java support.* Covers the continuing improvement of XML support.* contains appendices that conceal the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and valuable info at the standardization approach.
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Additional resources for Advanced SQL: 1999 - Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems)
As in other object-oriented systems, the semantics/behaviors of these types are provided through routines (including methods, of course, as well as--in a limited sense, at least--functions and procedures). 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.
The inclusion of the phrase user-defined implies--obviously, I suppose, to most people--that the type isn't built in to the database system, but is defined in some other manner. Before examining user-defined types specifically, let's take a brief look at the history that brought us to this discussion. 1 Evolutionof Type Systems SQL database systems have always had a selection of built-in data types that are available for use in applications. They range from types specified in the SQL standard (like INTEGER and SMALLINT, CHARACTER and CHARACTER VARYING, and DATE, TIME, and TIMESTAMP) to proprietary types defined by individual database system products (such as Sybase's SMALLMONEY and IMAGE types or Oracle's NUMBER and RAW types).
1 for details about methods and their invocation syntax). One of these methods is called an observer method and the other a mutator method; the 7 Attribute defaults are not permitted for structured types defined using Java. 42 Chapter 2 User-Defined Types observer m e t h o d returns to its caller the value of its associated attribute in a structured type instance, while the mutator m e t h o d allows the value of its associated attribute to be changed. In fact, one pair of methods (an observer and a mutator) is automatically created for each attribute by the database system when the structured type is created; you don't have to explicitly create them in any way other than defining the attributes of the type.
Advanced SQL: 1999 - Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems) by Jim Melton