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Do I need to declare local variables ahead of time using the local term In a word: No Even when you start declaring global variables, you don t need to declare local variables ahead of time by using the local term: You can continue to create your local variables by using set statements at any point in your code But you sensed a but coming, didn t you when you use global variables, you may find it helpful to use local declarations so that your code is absolutely clear about the scope of each variable You may also benefit from declaring local variables ahead of time so that you can place all the local variable declarations for a subroutine together in the same place, where you can easily see all the variables the subroutine uses This is helpful both when you revisit your code after a while and when someone else is trying to come to grips with your code

These equations are valid at the frequency fo for which the line length measures 1 4 wavelength Sometimes, the word wavelength is replaced by the lowercase Greek letter lambda ( ), so you will occasionally see the length of a quarter-wave section denoted as (1 4) or 025 Neglecting line losses, the preceding relations hold at all odd harmonics of fo, that is, at 3fo, 5fo, 7fo, and so on At other frequencies, a quarter-wave section of line does not act as a transformer Instead, it behaves in a complex manner that is beyond the scope of this discussion Quarter-wave transmission-line transformers are most often used in antenna systems, especially at the higher frequencies, where their dimensions become practical A quarter-wave matching section should be made using unbalanced line if the load is unbalanced, and balanced line if the load is balanced A disadvantage of quarter-wave sections is the fact that they work only at specific frequencies But this is often offset by the ease with which they are constructed, if radio equipment is to be used at only one frequency, or at odd-harmonic frequencies

SELECT stoplist_id, name FROM sys.fulltext_stoplists;

In this example, you use a global variable to make information available to different subroutines in a script This example uses a script shown earlier in the chapter The script includes several features you haven t learned about in detail, including creating and calling subroutines and displaying dialog boxes, but you ll find it easy to work through To create the script, follow these steps:

Our next query returns a list of stopwords for our user-defined stoplists in the database. Note the linking to get the associated stoplist name and language:

Problem 18-5 Suppose an antenna has a purely resistive impedance of 100 It is connected to a 1 4-wave section of 75- coaxial cable What is the impedance at the input end of the section Use the formula from above:

SELECT sl.name as StoplistName , sw.stopword as StopWord, lg.alias as LanguageAlias , lg.name as LanguageName, lg.lcid as LanguageLCID FROM sys.fulltext_stopwords sw JOIN sys.fulltext_stoplists sl ON sl.stoplist_id = sw.stoplist_id JOIN master.sys.syslanguages lg ON lg.lcid = sw.language_id;

1 In AppleScript Editor, press z-N or choose File | New to create a new script 2 Create the global variable myUserName at the beginning of the script by typing the

This next query gets a list of all of the stopwords that ship with SQL Server 2008:

R in = Z o2/R out = 752/100 = 5625/100 = 56

global term and the variable s name:

SELECT ssw.stopword, slg.name FROM sys.fulltext_system_stopwords ssw JOIN sys.fulltext_languages slg ON slg.lcid = ssw.language_id;

So far we ve learned how to create catalogs and full-text indexes, along with a variety of ways to get information back out of our indexes. All are great tools for the database developer. If you re a database administrator, though, there are few more tricks you can use to administer and take care of your full-text indexes.

(continued)

Problem 18-6 Consider an antenna known to have a purely resistive impedance of 600 You want to match it to the output of a radio transmitter designed to work into a 500- pure resistance What is the characteristic impedance needed for a quarter-wave matching section Use this formula:

Let s start with a few basic queries. First, let s retrieve a list of the catalogs that are associated with the current database.

SELECT fulltext_catalog_id, name, is_default FROM sys.fulltext_catalogs;

global myUserName get_user_name()

Z 2 = R inR out = 600 50 = 30,000