By Jim Melton
complex SQL:1999 - figuring out Object-Relational and different complex positive aspects is the practitioner's guide to the standard's complicated good points. it isn't a re-presentation of the normal, yet fairly an authoritative, in-depth consultant to its sensible software. Like its better half, SQL:1999 - realizing Relational Language parts , which defined the standard's simple positive factors, this ebook 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 subject matters very easily. it truly is both precious to these upgrading from previous models of SQL and people without past adventure. Written by means of the standard's unusual editor, complex SQL:1999 will entire your wisdom and aid your abilities like no different e-book can. * Focuses totally at the concerns that topic to programmers who're connecting purposes to databases. * info SQL:1999's item amenities, together with established user-defined forms, typed tables, user-defined workouts, and regimen invocation. * Examines amenities new to SQL, together with these in terms of online analytical processing (OLAP), administration of exterior facts (SQL/MED), and Java help. * Covers the continuing improvement of XML aid. * comprises appendices that conceal the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and important info at the standardization procedure.
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Extra resources for Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems)
Therefore, an instance of "Movie available on VHS" has all of the characteristics of the "Movie" recorded on the VHS tape, and has additional characteristics as well. An instance of "Movie available on DVD" m a y not have all of the characteristics of an instance of "Movie available on VHS," but it certainly has all of the characteristics of the "Movie" itself, as well as its own additional characteristics. SQL and other object-oriented systems use the word subtype to describe a data type that has all of the characteristics~including stored data and b e h a v i o r s ~ o f a n o t h e r type.
Number u or perhaps c. cus t_add r . z i p_code, base or even c. cus t_addr . z i p_code, base () Invocation of one of those methods must be written using the dot notation that I showed you in the previous section (note, however, that an empty pair of parentheses are permitted--but not required--to indicate that the invocation has no arguments other than the implicit one). The data type of the value returned by the observer m e t h o d is the data type of the attribute, which of course is also the data type of the plain dot notation expression (without the parentheses that you might normally associate with functional notation).
7 Chapter Summary 19 This chapter included 9 A brief introduction to object orientation and SQL's interpretation of the object model. 9 An introduction to SQL:1999's structured user-defined types at a very high level, giving a preview of the material that will be covered in significantly more detail in other chapters. 9 A review of the features that an SQL implementation must provide in order to claim conformance to object-oriented SQL. 9 A survey of the support that you will find in SQL products that are actually on the market.
Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems) by Jim Melton