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To satisfy the first query, the optimizer uses index seeks and bookmark lookups (bookmark lookups are also known as clustered key lookups). The second query uses index seeks only this is a much simpler and cheaper plan. This is why the optimizer expects the cost of the first query to be approximately 99 times more than the cost of the second one, as shown in figure 1. Don t expect to get exactly 99 percent when you run the queries on your server your mileage may vary, depending on your version of SQL Server. For example, I m sometimes getting different benchmark results running the same query against the same data on SQL Server 2000 and SQL Server 2005. Yet you should get similar numbers the second query is dramatically more efficient. The optimizer thinks so, and the real execution costs confirm that the optimizer is right. If the range is wide enough, the noncovering index is no longer used for the range query the whole clustering index (the whole table) is scanned instead. But only a portion of a covering index is scanned even if the range is wide. You can run the two queries in listing 4 and see for yourself.

tell the application "TextEdit" if exists front document then set the text of the front document to "Bankers' Remuneration Policy" end if end tell

SELECT [DueDate],[OrderQty] FROM [AdventureWorks].[Production].[WorkOrder] WHERE [DueDate] BETWEEN '20040630' AND '20040830' SELECT [DueDate],[OrderQty] FROM [AdventureWorks_Copy].[Production].[WorkOrder] WHERE [DueDate] BETWEEN '20040630' AND '20040830'

Digital Audio Tape Digital audio tape (DAT) is magnetic recording tape on which binary digital data can be recorded In digital audio recording, tape noise is practically eliminated because such noise is analog in nature Some electronic noise is generated in the analog amplification stages following D/A conversion, but this is minimal compared with the noise generated in older, fully analog systems The reduced noise in DAT equipment provides more true-to-life reproduction than is possible with analog methods With DAT, multigeneration copies can be made with practically no degradation in audio fidelity The reason for this is the same as the reason a computer can repeatedly read and overwrite data on a magnetic disk On DAT, the bits are represented by distinct magnetized regions on the tape While analog signals are fuzzy in the sense that they vary continuously, digital signals are crisp Imperfections in the recording apparatus, the tape itself, and the pickup head affect digital signals less than they affect analog signals Digital signal processing can eliminate the minute flaws that creep into a digital signal each time it is recorded and played back Vinyl Disk Vinyl disks were superseded years ago by CDs and Internet downloads, but some audiophiles are still intrigued by vinyl Some vinyl disks, and the turntables that can play them, have attained considerable value as collectors items The main trouble with vinyl is that it can be physically damaged by even the slightest mishandling Electrostatic effects can produce noise when the humidity is low, as in alpine or far northern regions in the winter Vinyl disks require a turntable that spins at speeds of 33 and 45 revolutions per minute (rpm) There are various drive systems These are called rim drive, belt drive, and direct drive The best type is a matter of individual taste because there are various factors to consider, such as cost, audio quality, ruggedness, and durability.

As you have seen, a covered query runs faster, because It may be satisfied by a simpler plan (this is true for many but not all queries). It needs to perform fewer reads. It may need to acquire less locks (this is true for many but not all queries).

The exists command works widely in AppleScript, and you can spare yourself plenty of errors by using it to look before you leap

In general, blanket statements are rarely true in database programming. In particular, some rules of thumb are true for noncovering indexes, but not true for covering indexes. For instance, the rule an index can only be used if the condition in the WHERE clause is index friendly doesn t apply to covering indexes although the following condition isn t index friendly: