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If the primary key (OFFICE) of a row in the parent table (OFFICES) is modified, all of the current children of that row become orphans because their foreign keys no longer match a primary key value The referential integrity features of DB2 and the ANSI/ISO SQL standard handle each of these four situations The first problem (INSERT into the child table) is handled by checking the values of the foreign key columns before the INSERT statement is permitted If they don't match a primary key value, the INSERT statement is rejected with an error message In Figure 11-1 this means that before a new salesperson can be added to the SALESREPS table, the office to which the salesperson is assigned must already be in the OFFICES table As you can see, this restriction "makes sense" in the sample database.

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maintained a great deal of information about the application plan, it can make this automatic rebinding completely transparent to the application program. However, a SQL statement may take much longer to execute when its plan is rebound than when the plan is simply executed. Although the DBMS can automatically rebind a plan when one of the structures upon which it depends is changed, the DBMS will usually not automatically detect changes in the database that may make a better plan possible. For example, suppose a plan uses a sequential scan of a table to locate particular rows because no appropriate index existed when it was bound. It s possible that a subsequent CREATE INDEX statement will create an appropriate index. To take advantage of the new structure, you must explicitly run the BIND program to rebind the plan.

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standards and languages for implementing them a Microsoft-led camp under the .NET framework, and a rival camp focused on Java and J2EE-based application servers. Both architectures embrace a key role for XML, a standard for exchanging structured data like the data that resides in SQL databases. In response to the industry attention on web services, a flurry of products has been announced that link XML-formatted messages to SQL-based databases. Startup database vendors and some of the object database vendors have announced XML-based database products, arguing that they provide an ideal, native match for the XML-formatted exchange of data over the Internet. The established relational database players have responded with their own XML initiatives, adding XML input/output capabilities, and in some cases, XML data type support, to their products. The interaction between XML and SQL is one of the most active areas in data management today, and the activity in this area will keep SQL in the industry spotlight well into the first decade of the twentyfirst century.

The simplest SQL statements to embed in a program are those that are self-contained and do not produce any query results. For example, consider this interactive SQL statement: Delete all salespeople with sales under $150,000.

The SQL1 standard specifies that a cursor can only move forward through the query results. Until the last few years, most commercial SQL products also supported only this form of forward, sequential cursor motion. If a program wants to reretrieve a row once the cursor has moved past it, the program must CLOSE the cursor and reOPEN it (causing the DBMS to perform the query again), and then FETCH through the rows until the desired row is reached. In the early 1990s, a few commercial SQL products extended the cursor concept with the concept of a scroll cursor. Unlike standard cursors, a scroll cursor provides random access to the rows of query results. The program specifies which row it wants to retrieve through an extension of the FETCH statement, shown in Figure 19-28: I FETCH FIRST retrieves the first row of query results. I FETCH LAST retrieves the last row of query results. I FETCH PRIOR retrieves the row of query results that immediately precedes the current row of the cursor. I FETCH NEXT retrieves the row of query results that immediately follows the current row of the cursor. This is the default behavior if no motion is specified and corresponds to the standard cursor motion. I FETCH ABSOLUTE retrieves a specific row by its row number. I FETCH RELATIVE moves the cursor forward or backward a specific number of rows relative to its current position.

DELETE FROM SALESREPS WHERE SALES < 150000.00;

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