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Advanced SQL:1999: Understanding Object-Relational and Other by Jim Melton

By Jim Melton

complicated SQL:1999 - knowing Object-Relational and different complex positive aspects is the practitioner's guide to the standard's complicated beneficial properties. it isn't a re-presentation of the traditional, yet particularly an authoritative, in-depth consultant to its functional software. Like its better half, SQL:1999 - realizing Relational Language parts , which defined the standard's simple positive aspects, this booklet will assist you to make your purposes either powerful and standard-compliant.

this useful reference has a modular layout so that you can discover particular themes comfortably. it truly is both helpful to these upgrading from past models of SQL and people without prior event. Written by way of the standard's special editor, complex SQL:1999 will whole your wisdom and help your abilities like no different e-book can. * Focuses completely at the concerns that topic to programmers who're connecting functions to databases. * information SQL:1999's item amenities, together with established user-defined kinds, typed tables, user-defined exercises, and regimen invocation. * Examines amenities new to SQL, together with these on the subject of online analytical processing (OLAP), administration of exterior facts (SQL/MED), and Java aid. * Covers the continuing improvement of XML aid. * comprises appendices that hide the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and helpful info at the standardization method.

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Extra info for Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems)

Example text

They provide strong typing in the SQL language (in which typing is traditionally viewed as moderately strong at best, since you are allowed to mix data types in expressions within fairly generous bounds). The best way to explain SQL's distinct types is by example. Consider an application that gathers information about people who buy music CDs and videotapes in an effort to learn how to predict, based on their demographics, what products people will be interested in hearing more about. This application--let's call it OEM06RAPH--mightgather quite a variety of data in hope that a data mining product could use it to uncover unexpected relationships.

You can prevent their access by unauthorized users through the use of SQL's long-standing privilege mechanisms, such as denying EXECUTE privilege to some users on the methods. At this point, let's stop talking about attributes and their pairs of methods. " But, for now, you've got the basics of attributes and are ready to tackle structured types' semantics. 2, you learned that the semantics of SQL's structured types is provided through the use of routines and that SQL:1999 allows the behaviors of its user-defined types to be provided through routines written in any of several languages, including Java.

By contrast, procedures are routines that return values only t h r o u g h parameters. 9 Procedures are typically invoked using some form of "CALL" statement. In SQL, procedures can have b o t h input parameters and o u t p u t parameters (and parameters that are b o t h at once). In SQL:1999, a m e t h o d is a special type of function. 1. In other words, an SQL:1999 m e t h o d is a function that is closely associated with a single structured type 1~ and is defined in the same schema as that type, that must be invoked using dot notation, and whose invocations might not be fully resolved w h e n the containing program is compiled.

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