Download e-book for iPad: Advanced SQL:1999: Understanding Object-Relational and Other by Jim Melton

By Jim Melton

ISBN-10: 1558606777

ISBN-13: 9781558606777

complex SQL:1999 - knowing Object-Relational and different complicated good points is the practitioner's guide to the standard's complicated gains. it's not a re-presentation of the normal, yet particularly an authoritative, in-depth advisor to its sensible program. Like its significant other, SQL:1999 - knowing Relational Language elements , which defined the standard's simple beneficial properties, this publication will assist you make your functions either powerful and standard-compliant.

this convenient reference has a modular layout so that you can discover particular themes very easily. it's both beneficial to these upgrading from prior models of SQL and people with out past event. Written by way of the standard's individual editor, complicated SQL:1999 will whole your wisdom and aid your talents like no different publication can. * Focuses completely at the matters that subject to programmers who're connecting purposes to databases. * information SQL:1999's item amenities, together with dependent user-defined kinds, 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 facts (SQL/MED), and Java aid. * Covers the continued improvement of XML help. * contains appendices that hide the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and precious info at the standardization strategy.

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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

Caveat programmer! 5 Attribute Characteristics Attributes, as I've said several times, are where structured types store their data. Naturally, attributes have various characteristics, the most evident of which are their names and their data types. ) But attributes have characteristics other t h a n n a m e and data type, as well. 6 Attributes in Detail zi p_code base plus4 NOT FINAL 41 ROW ( CHARACTER(5), CHARACTER(4) ) ) Like columns in SQL's tables, attributes have a "default default" value--the null v a l u e - - t h a t is used whenever the application designer doesn't provide a different default value.

For example, SQL-92 provided three datetime types (DATE, TIME, and TIMESTAMP) for which there were no mappings to host language types. Similarly, SQL:1999 provides an ARRAY type and a ROW type for which the SQL standard provides no m a p p i n g to host language data types (although such mappings are possible for most host languages and some vendors are expected to provide these mappings as product extensions). You may not be surprised to learn that SQL:1999 does not provide direct mappings from structured types to host language types, 6 either.

For one thing, it was unlikely that this technique would continue to be successful if it were applied to dozens of specialized types. Instead, a more generalized approach was required. The answer (obvious to some, but not all, observers) was deceptively simple: build into SQL engines the capability to allow application builders to define their own specialized data types, especially including code to provide the semantics of those types. Some vendors used a pure SQL approach to providing this capability, while others used a hybrid approach that allowed SQL to invoke code written in another programming language, sometimes even supporting data types of that other language directly in the SQL engine.

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Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems) by Jim Melton


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