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With AUTO or MANUAL, you don t have much choice, but with OFF mode, there s an additional option: OFF, NO POPULATION When you tack on NO POPULATION, SQL Server will create the full-text index but not populate it This would be useful when you want to break your scripts into two parts one to create the full-text indexes, and.

You need to create a text-only version of the script so that you can edit it in a word processor or text editor

Have you been wondering what j actually means in expressions of impedance Well, j is nothing but a number: the positive square root of 1 There s a negative square root of 1, too, and it is equal to j When either j or j is multiplied by itself, the result is 1 (Pure mathematicians often denote these same numbers as i or i) The positive square root of 1 is known as the unit imaginary number The set of imaginary numbers is composed of real-number multiples of j or j Some examples are j4, j3579, j2576, and j25,000 The square of an imaginary number is always negative Some people have trouble grasping this, but when you think long and hard about it, all numbers are abstractions Imaginary numbers are no more imaginary (and no less real) than so-called real numbers such as 4, 3579, 2576, or 25,000 The unit imaginary number j can be multiplied by any real number on a conventional real number line If you do this for all the real numbers on the real number line, you get an imaginary number line (Fig 15-1) The imaginary number line should be oriented at a right angle to the real number line when you want to graphically portray real and imaginary numbers at the same time In electronics, real numbers represent resistances Imaginary numbers represent reactances

a second you d use later to populate them, perhaps during off hours, using the ALTER statement as shown later in this chapter. Now that the full-text index has been created, we re ready for step three, querying data from our full-text index. Before we proceed, let s take a few moments to examine how to maintain our full-text indexes.

Table 3-2

Anyone with five minutes of experience in the computer industry knows that the one thing that s constant is change. SQL Server provides many ways to change our full-text indexes, most of which are variations of the ALTER command. Let s look at some ways to maintain the index we just created in the previous section. The first statement is

ALTER FULLTEXT INDEX ON Production.ProductDescription START UPDATE POPULATION;

When you add a real number and an imaginary number, you get a complex number In this context, the term complex does not mean complicated A better word would be composite Examples are

Q: A:

This is the command to update the full-text index when CHANGE_TRACKING is set to MANUAL, and probably the command you ll use the most. When issued, SQL Server will roll through all of the rows in the table, and will update the corresponding full-text index for rows that have been marked as updated. To make life easier, you could issue this command from a scheduled SQL Server job on a timed basis. A corresponding command is the full population command:

When I m saving a script in the Script format, what happens if I select the Run Only check box The code vanishes into thin air More seriously: When you save a script in the Script format, select the Run Only check box if you want to prevent the commands in the script from being visible This sounds odd, but it s useful when you need to distribute a script but you don t want anybody to be able to see how it works Use this run-only option only for versions of scripts that are ready for distribution, not for working versions or reference versions that you need to be able to read and edit

ALTER FULLTEXT INDEX ON Production.ProductDescription START FULL POPULATION;

4 + j5, 8 j 7, 7 + j13, and 6 j 87 The set of complex numbers needs two dimensions a plane to be graphically defined