By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)
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This can be a coder's publication. it really is meant to aid builders construct purposes that utilize Transact-SQL. it isn't approximately database management or layout. it isn't approximately end-user or GUI program improvement. it isn't even approximately server or database functionality tuning. it truly is approximately constructing the simplest Transact-SQL code attainable, whatever the program.
Info warehouses have advanced to deal with the large volumes of knowledge flowing in the course of the office through keeping apart the knowledge used for reporting and choice making from the operational platforms. the aim of the knowledge warehouse is just to shop the uncooked information, and together with Microsoft SQL Server 2000 research providers, this knowledge may be remodeled into obtainable details that displays the true components affecting the firm.
Base SAS software program helps established question Language (SQL), the ANSI usual and familiar language that permits you to create, retrieve, and replace database details. This identify is your introductory, task-oriented source for SQL as applied throughout the SAS SQL approach. With this identify, you'll research the fundamentals of utilizing PROC SQL, together with retrieving information from unmarried and a number of tables, deciding upon particular information from tables, subsetting, ordering, and summarizing facts, updating tables, combining tables to create new tables and priceless reviews, appearing queries on database administration approach (DBMS) tables, utilizing PROC SQL with the SAS macro facility, and debugging and optimizing PROC SQL code.
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By contrast, Java requires that its methods all be written in a single programming language: Java. SQL provides several sorts of SQL-invoked routines: procedures, (ordinary) functions, a n d m m o s t important for UDTs~methods. In Chapter 4, "Routines and Routine Invocation," I'll cover the similarities and the differences in considerable detail. For now, the relevant observation is that a m e t h o d is an SQLinvoked routine that is very closely associated with a specific UDT and that is intended to provide behaviors of that UDT.
The most powerful use of p o l y m o r p h i s m in SQL occurs along with the use of inheritance: a P] ayClip m e t h o d designed to play a clip from a music source whose identity is passed as an argument might effectively play clips from a subtype of "music source," such as CD or MusicDVD. On the other hand, you might choose to write a different version of P] ayC] i p that handles DTD DVDs differently, but you can continue to use the n a m e PlayC] i p regardless of the kind of music source you identify w h e n you call the routine.
Such functions, if defined, provide at least part of the distinct type's semantics. It's beyond the scope of this book to go into that level of detail about distinct types, though; if you're interested in it, I urge you to acquire one of the SQL:1999 books that are (or soon will be) available. By the way, if you are familiar with SQL-92, you've probably learned something about its domain capabilities. While SQL:1999 retains that facility (and makes no statement about its relationship to distinct types), I believe that distinct types provide a much better solution to the problems that domains attempted to solve.