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Cancel-an-order To cancel a customer s order, the program should (a) delete the order from the ORDERS table, (b) update the PRODUCTS table, adjusting the quantity-on-hand total for the product, (c) update the SALESREPS table, subtracting the order amount from the salesperson s total sales, and (d) update the OFFICES table, subtracting the order amount from the office s total sales..

conditions. Enter and execute the following SQL statement:

12:

Reassign-a-customer When a customer is reassigned from one salesperson to another, the program should (a) update the CUSTOMERS table to reflect the change, (b) update the ORDERS table to show the new salesperson for all orders placed by the customer, (c) update the SALESREPS table, reducing the quota for the salesperson losing the customer, and (d) update the SALESREPS table, raising the quota for the salesperson gaining the customer. In each of these cases, a sequence of four or five actions, where each action consists of a separate SQL statement, is required to handle the single logical transaction. The transaction concept is critical for programs that update a database, because it ensures the integrity of the database. A SQL-based DBMS makes this commitment about the statements in a transaction: The statements in a transaction will be executed as an atomic unit of work in the database. Either the results of all of the statements will be applied to the database, or none of the statements will have results posted to the database. The DBMS is responsible for keeping this commitment even if the application program aborts or a hardware failure occurs in the middle of the transaction, as shown in Figure 12-1. In each case, the DBMS must make sure that when failure recovery is complete, the database never reflects a partial transaction.

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SELECT d.CD_TITLE, t.TYPE_NAME FROM COMPACT_DISCS d FULL JOIN COMPACT_DISC_TYPES dt ON d.COMPACT_DISC_ID = dt.COMPACT_DISC_ID FULL JOIN MUSIC_TYPES t ON dt.MUSIC_TYPE_ID = t.TYPE_ID;

The major challenge to SQL s continued dominance as a database standard has come from the emergence of object-based programming through languages such as Java and C++, and from the introduction of object-based databases as an extension of the broad market trend toward object-based technology. SQL-based database vendors have responded to this challenge by slowly expanding and enhancing SQL to include object features. These object/ relational databases, which continue to be based on SQL, have emerged as a more popular alternative to pure object databases and have perpetuated SQL s dominance through the last decade. The newest wave of object technology, embodied in the XML standard and web services architectures, once again created a crop of XML databases and alternative query languages to challenge SQL in the early 2000s. But once again, the major vendors of SQLbased databases responded by adding XML-based extensions, meeting the challenge and securing SQL s continuing importance. History suggests that this extend and integrate approach will be successful in warding off new challenges in the future as well.

With the exploding popularity of the Internet and the World Wide Web, and their standards-based foundation, SQL found a new role in the late 1990s as an Internet data access standard. Early in the development of the Web, developers needed a way to retrieve and present database information on web pages and used SQL as a common language for database gateways. More recently, the emergence of three-tiered Internet architectures with distinct thin client, application server, and database server layers, has established SQL as the standard link between the application and database tiers. The role of SQL in multitier

Your query results should now include 26 rows rather than 24. This is because the MUSIC_ TYPES table includes two rows that are unmatched: the Jazz row and the International row. In other words, no CDs match up to either of these two music types.

Part I:

In this Try This exercise, you created comma-separated, cross, and condition joins. The condition joins included inner and outer joins. As you can see, join operations provide a great deal of flexibility when querying data from the tables in your database. However, they re not the only solution when accessing data from more than one table. A subquery will often provide the same functionality as a join. In 12, I discuss subqueries in great detail. As you will see, they provide yet one more way for you to access data from multiple tables.

architectures is now beginning to extend beyond the back-end database layer, to include data caching and real-time data management in or near the application tier.

Java Integration (JDBC)

five rows and the second table contains three rows. How many rows will the Cartesian product table contain

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