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Listing 4-32. Using a Subquery to Retrieve All BLD Courses select attendee from registrations where course in (select code from courses where category = 'BLD'); ATTENDEE -------7499 7566 7698 7788 7839 7876 7788 7782 7499 7876 7566 7499 7900 This eliminates both objections to the initial solution with the hard-coded course codes. Oracle first substitutes the subquery between the parentheses with its result a number of course codes and then executes the main query. (Consider first substitutes ... and then executes ... conceptually; the Oracle optimizer could actually decide to execute the SQL statement in a different way.) Apparently, 13 employees attended at least one build course in the past (see Listing 4-32). Is that really true Upon closer investigation, you can see that some employees apparently attended several build courses, or maybe some employees even attended the same build course twice. In other words, the conclusion about the number of employees (13) was too hasty. To retrieve the correct number of employees, you should use SELECT DISTINCT in the main query to eliminate duplicates.

Table 10-1: Profiling API Support Item Run time AppDomain Assembly Module Class Function Thread Remoting Notification Types Managed execution (all threads) suspended and resumed, individual managed thread suspend and resume Startup, shutdown Load, unload Load, unload, attach Load, unload JIT Compilation, cache function search, pitched (removed from memory), inlined, unload Created, destroyed, assigned to an OS thread Client invocation, client message sending, client receiving reply, server receiving message, invocation, server sending reply Managed to unmanaged, unmanaged to managed, COM VTable creation, COM VTable destruction time Suspend, suspend aborted, resume, thread suspended, thread resumed Object allocated, allocations by class, moved reference, object references, root references Thrown, search, filter, catcher entered, catcher found, call OS handler, unwind function, unwind finally, CLR catcher found, CLR catcher executed

How can we determine whether any aspects of your web application are not compliant with Section 508 What does it mean for an application to be accessible Will the updated web application be awkward to use with a traditional keyboard, mouse, and monitor if we make it accessible What types of things do you need to do to make your web application compliant with Section 508

SET NOCOUNT ON; USE master; IF DB_ID('Performance') IS NULL CREATE DATABASE Performance; GO USE Performance; GO -- Creating and Populating the Nums Auxiliary Table SET NOCOUNT ON; IF OBJECT_ID('dbo.Nums', 'U') IS NOT NULL DROP TABLE dbo.Nums; CREATE TABLE dbo.Nums(n INT NOT NULL PRIMARY KEY); DECLARE @max AS INT, @rc AS INT; SET @max = 1000000; SET @rc = 1; INSERT INTO dbo.Nums(n) VALUES(1); WHILE @rc * 2 <= @max BEGIN INSERT INTO dbo.Nums(n) SELECT n + @rc FROM dbo.Nums; SET @rc = @rc * 2; END INSERT INTO dbo.Nums(n) SELECT n + @rc FROM dbo.Nums WHERE n + @rc <= @max; GO -- Drop Data Tables if Exist IF OBJECT_ID('dbo.EmpOrders', 'V') IS NOT NULL DROP VIEW dbo.EmpOrders; GO IF OBJECT_ID('dbo.Orders', 'U') IS NOT NULL DROP TABLE dbo.Orders; GO IF OBJECT_ID('dbo.Customers', 'U') IS NOT NULL DROP TABLE dbo.Customers; GO IF OBJECT_ID('dbo.Employees', 'U') IS NOT NULL DROP TABLE dbo.Employees; GO IF OBJECT_ID('dbo.Shippers', 'U') IS NOT NULL DROP TABLE dbo.Shippers; GO -- Data Distribution Settings DECLARE @numorders AS INT, @numcusts AS INT, @numemps AS INT, @numshippers AS INT, @numyears AS INT, AS DATETIME; @startdate

employeeNum < employee.first + employee.offset + employee.total; employeeNum++ ) { ... }

Your choice of a single-tenant or multi-tenant architecture will affect how easy it is to develop, deploy, maintain, and monitor your application. Maintaining the Code Base Maintaining separate code bases for different customers will rapidly lead to escalating support and maintenance costs for an ISV because it becomes more difficult to track which customers are using which version. This will lead to costly mistakes being made. A multi-tenant system with a single, logical instance guarantees a single code base for the application. You can still maintain a single code base with a multi-instance, single-tenant model, but there could be a short-term temptation (with long-term consequences) to branch the code for

9

Internet Typical Internet-connected VPN servers have at least two LAN connections: one connected to the Internet (either directly or connected to a perimeter network) and one connected to the organization intranet. To make this distinction easier to see during the Routing And Remote Access Server Setup Wizard, rename the connections with their purpose or role by

Here is an example of a type that implements this generic interface and that specifies type arguments . Notice that a Triangle object can enumerate a set of Point objects . Also note that the Current property is of the Point data type:

I am starting with a short introduction to XML . After that, I am going to show how you can create XML as result of a query using different flavors of the FOR XML clause . You can also shred XML to relational tables using the OPENXML rowset function . Support for the FOR XML clause and OPENXML function were introduced in SQL Server 2000; support was slightly enhanced in SQL Server 2005 and SQL Server 2008 .

Int32 SomeOtherMethod(Stream s);