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

By Jim Melton

complicated SQL:1999 - realizing Object-Relational and different complex beneficial properties is the practitioner's guide to the standard's complicated good points. it's not a re-presentation of the normal, yet quite an authoritative, in-depth advisor to its useful software. Like its better half, SQL:1999 - figuring out Relational Language elements , which defined the standard's easy positive factors, this ebook will help you make your purposes either powerful and standard-compliant.

this useful reference has a modular structure so that you can discover particular issues conveniently. it really is both worthy to these upgrading from past models of SQL and people with out prior event. Written via the standard's exotic editor, complicated SQL:1999 will whole your wisdom and aid your abilities like no different booklet can. * Focuses solely at the concerns that subject to programmers who're connecting purposes to databases. * information SQL:1999's item amenities, together with established user-defined varieties, typed tables, user-defined workouts, and regimen invocation. * Examines amenities new to SQL, together with these when it comes to online analytical processing (OLAP), administration of exterior info (SQL/MED), and Java help. * Covers the continued improvement of XML help. * comprises appendices that disguise the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and precious info at the standardization approach.

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

Sample text

Similarly, a type named movie might contain components such as t i t l e, length, and description. Instances of SQL's structured types are values, no less than instances of SQL's INTEGER type are values. 3, values of a structured type may, under certain circumstances, take on some characteristics of objects, but they are first and foremost values of their user-defined type. In SQL:1999, users may create any n u m b e r of structured types and use them as first-class types in their databases and applications.

SQL has no analog to this capability (although it may be added in a future version of the standard); all methods in SQL are effectively public methods. 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.

M not an unexpected q u e s t i o n . , especially since I just said that it doesn't have to be a type defined by a user at all! 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.

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