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Database Design for Smarties: Using UML for Data Modeling by Robert J. Muller PDF

By Robert J. Muller

ISBN-10:

ISBN-13: 0403020100543

ISBN-10: 1558605150

ISBN-13: 9781558605152

While you're searching for complex SQL-Server thoughts, this booklet isn't really TOO undesirable. it's a stable place to begin if you haven't had the chance to benefit from specialists or adventure already. yet, there's not anything very earth-shattering in right here, as I put up a loose publication approximately complicated T-SQL set-based operations, large-database tuning, and extra that is going way past what's during this publication. yet, it's greater than so much SQL-Server books out there, due to the fact that many others look like simply slightly greater than a help-file reprint.

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2. An operation within a contained scope sn may "raise" an exception of type t. 3. The exception is "caught" by the most immediately containing scope that has an exception handler. The call stack is automatically unwound by the run-time system out to the level of the handler. Memory is freed for all objects allocated in intervening stack frames. Any transactions - 32 - begun within a nested scope, that is, unwound by the run-time system in the process of searching up the stack for an exception handler, are aborted.

These are encapsulated types in the sense that their internal structure is completely inaccessible to SQL. You typically retrieve the LOB in a program, then convert its contents into an object of some kind. Both the conversion and the behavior associated with the new object are in your client program, though, not in the database. Oracle8 provides the BLOB, CLOB, NCLOB, and bfile types. A BLOB is a binary string with any structure you want. The CLOB and NCLOB are character objects for storing very large text objects.

Because of its clear distinction between abstract and concrete structures, this hierarchy has no need to declare table inheritance. Consider a hierarchy of Roles as a counterexample. Figure 2-9 shows the Role as a class representing a connection between a Person and a CriminalOrganization. You could create a class hierarchy representing the different kinds of roles (Boss, Lieutenant, Soldier, Counselor, Associate, for example), and you could leave Role as a kind of generic association. You would create a Role table as well as a table for each of its subtypes.

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Database Design for Smarties: Using UML for Data Modeling (The Morgan Kaufmann Series in Data Management Systems) by Robert J. Muller


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