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If you do not specify a rule, the RESTRICT rule is the default, because it has the least potential for accidental destruction or modification of data Each of the rules is appropriate in different situations Usually, the real-world behavior modeled by the database will indicate which rule is appropriate In the sample database, the ORDERS table contains three foreign key/primary key relationships, as shown in Figure 11-2 These three relationships link each order to: I The product that was ordered I The customer who placed the order I The salesperson who took the order For each of these relationships, different rules seem appropriate: I The relationship between an order and the product that is ordered should probably use the RESTRICT rule for delete and update.

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The dramatic growth of PC LANs through the 1980s and 1990s created a new opportunity for departmental or workgroup database management. The original database systems focused on this market segment ran on IBM s OS/2 operating system. In fact, SQL Server, now a key part of Microsoft s Windows strategy, originally made its debut as an OS/2 database product. In the mid-1990s, Novell also made a concentrated effort to make its NetWare operating system an attractive workgroup database server platform. From the earliest days of PC LANs, NetWare had become established as the dominant network operating system for file and print servers. Through deals with Oracle and others, Novell sought to extend this leadership to workgroup database servers as well. The arrival of Windows NT, a specialized version of Windows tuned for server use, was the catalyst that caused the workgroup database market to really take off. While NetWare offered a clear performance advantage over NT as a workgroup file server, NT had a more robust, general-purpose architecture, more like the minicomputer operating systems. Microsoft successfully positioned NT as a more attractive platform for running workgroup applications (as an application server) and workgroup databases. Microsoft s own SQL Server product was marketed (and often bundled) with NT as a tightly integrated workgroup database platform. Corporate information systems departments were at first very cautious about using relatively new and unproven technology, but the NT/SQL Server combination allowed departments and non-IS executives to undertake smaller-scale, workgroup-level projects on their own, without corporate IS help. This phenomenon, like the grassroots support for personal computers a decade earlier, fueled the early growth of the workgroup database segment.

It shouldn t be possible to delete product information from the database if there are still current orders for that product, or to change the product number I The relationship between an order and the customer who placed it should probably use the CASCADE rule for delete and update You probably will delete a customer row from the database only if the customer is inactive or ends the customer s relationship with the company In this case, when you delete the customer, any.

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The embedded SQL development cycle may seem cumbersome, and it is more awkward than developing a standard C or COBOL program. In most cases, all of the steps in Figure 17-3 are automated by a single command procedure, so the individual steps are

can be embedded into another language, such as COBOL or C, to extend that language for use in database access. Alternatively, they can be explicitly sent to a database management system for processing, via a call-level interface from a language such as C, C++, or Java, or via messages sent over a computer network. Finally, SQL is not a particularly structured language, especially when compared to highly structured languages such as C, Pascal, or Java. Instead, SQL statements resemble English sentences, complete with noise words that don t add to the meaning of the statement but make it read more naturally. There are quite a few inconsistencies in the SQL language, and there are also some special rules to prevent you from constructing SQL statements that look perfectly legal, but don t make sense. Despite the inaccuracy of its name, SQL has emerged as the standard language for using relational databases. SQL is both a powerful language and one that is relatively easy to learn. The quick tour of SQL in 2 will give you a good overview of the language and its capabilities.

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