By Jim Melton
complex SQL:1999 - figuring out Object-Relational and different complicated positive aspects is the practitioner's guide to the standard's complex beneficial properties. it isn't a re-presentation of the normal, yet really an authoritative, in-depth consultant to its sensible software. Like its spouse, SQL:1999 - knowing Relational Language elements , which defined the standard's easy positive factors, this ebook will make it easier to make your functions either powerful and standard-compliant.
this useful reference has a modular structure so that you can discover particular subject matters comfortably. it really is both necessary to these upgrading from previous types of SQL and people with out earlier event. Written through the standard's distinct editor, complicated SQL:1999 will entire your wisdom and aid your talents like no different booklet can. * Focuses solely at the concerns that topic to programmers who're connecting functions to databases. * info SQL:1999's item amenities, together with dependent user-defined kinds, typed tables, user-defined exercises, and regimen invocation. * Examines amenities new to SQL, together with these with regards to online analytical processing (OLAP), administration of exterior facts (SQL/MED), and Java aid. * Covers the continuing improvement of XML aid. * comprises appendices that disguise the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and invaluable info at the standardization technique.
Read or Download Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems) PDF
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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)
3 Accessing Attributes You would be very surprisedmand disappointedmif you were to learn that attributes of structured types couldn't be accessed fairly easily. In fact, they can be accessed quite easily, using more t h a n one syntax notation. (To avoid any confu- 38 Chapter 2 User-Defined Types sion, let me state clearly that access doesn't only mean retrieve. ) The most intuitive notation (for developers using most popular programming languages, at least) is what we call dot notation. To access a structured type attribute using dot notation, you simply specify the name of the "site" (as you learned in Volume I of this book, a site is a place where data can be stored, including columns of rows, SQL variables and host variables, and parameters of routines) whose data type is that structured type, followed by a period (the eponymous "dot"), followed by the name of the attribute.
2 and spend the bulk of the chapter discussing in detail), it also provides a more limited variant called distinct types. The discussion of distinct types is relatively short, since the subject was covered in detail in Volume I of this book; in fact, I'm including it only for the sake of completeness. Most of this chapter's space, and energy, is spent on structured types. 1 Distinct Types A distinct type is a data type that is based on a single built-in data type, such as INTEGER, but whose values cannot be directly mixed in operations with that built-in type or with other distinct types based on that built-in type.
1 contains the syntax of the CREATE TYPE statement. Please don't be too intimidated by the m a n y different parts of this statement. I'll get to t h e m all in due time. My purpose in giving you the entire syntax now is so that I can refer back to it as I get to each c o m p o n e n t in the discussion of structured types throughout the rest of this chapter. 1 CREATETYPESyntax CREATE TYPE type-name [ UNDER supertype-name ] [