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about 8 in high by 18 in wide by 6 in deep It includes an AM/FM radio and a CD player The system gets its name from the loud bass acoustic energy peaks its speakers can deliver

level. For this index, WorkOrderID column is a bookmark it uniquely identifies rows in the table. Consider the following query:

set thisCPU to the CPU type of (system info) set thisMHz to the CPU speed of (system info) if thisCPU starts with "PowerPC" then error "Your Mac does not have an Intel processor" number 501 else if thisMHz < 2000 then error "Your Mac is not fast enough to run this application" number 555 end if end if

SELECT [DueDate],SUM([OrderQty]) AS SumQty FROM [AdventureWorks].[Production].[WorkOrder] GROUP BY [DueDate]

Quadraphonic Sound Quadraphonic sound refers to four-channel audio recording and reproduction It is also called quad stereo or four-channel stereo Each of the four channels is independent of the other three In a welldesigned quadraphonic sound system, the speakers should be level with the listener, equidistant from the listener, and separated by angles of 90 from the listener s point of view If the listener is facing north, for example, the left front speaker is to the northwest, the right front speaker is to the northeast, the left rear speaker is to the southwest, and the right rear speaker is to the southeast This provides optimum balance, and also facilitates the greatest possible left-to-right and front-to-rear contrast in the perceived sounds

The optimizer can choose to scan the whole clustering index (the whole table [AdventureWorks].[Production].[WorkOrder]) to satisfy this query, unless there s an index that would allow the query to run faster. You can create a covering index as follows:

Errors you produce may be custom, but they re not fake: AppleScript treats a custom error in exactly the same way as a built-in error, bringing the script to a screeching halt and putting up a dialog box on screen to warn the user what has happened This means you need to handle your custom errors in the same way as built-in errors by putting them inside try blocks, and by building error handlers to catch and process them Here is an example of trapping the two custom errors and displaying an alert (see Figure 10-8) that covers them both The lines in boldface are the ones added to the previous code snippet to create the error handler:

CREATE NONCLUSTERED INDEX [IX_WorkOrder_DueDate] ON [Production].[WorkOrder] ( [DueDate], [OrderQty] )

Methods of recording sound, particularly music, have evolved dramatically since the ascent of digital technology Several types of media are available, but the compact disk (CD) is the most common Other media include analog audio tape, digital audio tape, and (of historical interest) vinyl disk

try set thisCPU to the CPU type of (system info) set thisMHz to the CPU speed of (system info) if thisCPU starts with "PowerPC" then error "Your Mac does not have an Intel processor" number 501 else if thisMHz < 2000 then error "Your Mac is not fast enough to run this application" number 555 end if end if on error myErrorMessage number myErrorNumber

The index IX_WorkOrder_DueDate is several times smaller than the table [AdventureWorks].[Production].[WorkOrder]. Clearly, scanning this index will require fewer reads. The optimizer will choose to scan the index rather than a significantly bigger table that the index is created on.

Starting with SQL Server 2005, you can also use an INCLUDE clause for further optimization, as follows:

Figure 10-8 With an error handler added, the script displays an alert that encompasses both custom error messages

.

CREATE NONCLUSTERED INDEX [IX_WorkOrder_DueDate_with_INCLUDE] ON [Production].[WorkOrder] ( [DueDate] )INCLUDE([OrderQty])

All the tables in the AdventureWorks database are smallish, so you won t notice much difference between IX_WorkOrder_DueDate and IX_WorkOrder_DueDate_with_ INCLUDE. For really big tables, the index IX_WorkOrder_DueDate_with_ INCLUDE may give noticeably better performance. The INCLUDE clause will be discussed in more detail at the end of this chapter.

if myErrorNumber is equal to 501 or myErrorNumber is equal to 555 then display alert "This Mac cannot run UltraMegaApp" message "This Mac is not fast enough to run the application" end if end try