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In the early days of the internet, people would insert a large number of identical terms into their HTML page s metadata. Let s say that these terms represented, for example, what their company manufactured. An internet search engine utilizing just term count information would then artificially inflate their page with a higher score and bring it closer to the top of search results. This practice is known as keyword spamming. Our similarity coefficient calculation example at the beginning of this chapter did not demonstrate or even attempt to demonstrate this problem. This was because, first, we did not want to introduce too many things at once. We wanted you to concentrate on the calculations and understand how they are done. Second, it is impossible to illustrate this problem with such a small document repository. Let s face it; our example is totally unrealistic as far as repository size and document frequency are concerned. With that in mind we re going to ramp up our example to a realistic size and at the same time reduce our query to two terms and calculate the weight of two documents in the repository, D1 and D2. The increase in repository size will allow for reasonable number generation, and the query size reduction and weighting of only two documents will simplify the visualization of exactly what these numbers mean. Also, it

Relationships are represented by data in tables. To establish a relationship between two tables, you need to have data in one table that enables you to find a row or rows in another table. That s where keys come in, specifically primary and foreign keys.

will demonstrate what we meant when we presented figure 12.1 and how we derived that figure in the first place. Here are the new quantities we re going to work with:

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Listing 11-1. CommandSql.vb Imports System Imports System.Data Imports System.Data.SqlClient Module ConnectionSQL Sub Main() 'create connection Dim conn As SqlConnection = New SqlConnection _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind") 'create command Dim cmd As SqlCommand = New SqlCommand Console.WriteLine("Command created.") Try ' Open connection conn.Open() Catch ex As SqlException Console.WriteLine(ex) Finally ' Close connection conn.Close() Console.WriteLine("Connection closed.") End Try End Sub End Module 3. Run the program by pressing Ctrl+F5. You should see the output in Figure 11-1.

A primary key is a column or combination of columns whose values uniquely identify rows in a table. No column of a primary key can be null. Let s take a closer look at the Employees table in the Northwind database (see Figure 10-11). The first column is EmployeeID. It s marked as PK (primary key) and not null. EmployeeID uniquely identifies each employee (i.e., each row in Employees). In fact, it s the only column that does so and it doesn t need to be combined with any other columns to do it. For example, the LastName column, even though it s not null, can t be the primary key since more than one employee could have the same last name.

repository size of 10,000,000 documents query is gold truck gold appears in the repository in 80,000 documents truck appears in the repository in 120,000 documents gold appears in D1 two times and in D2 one time truck appears in D1 three times and in D2 six times

Details table has a composite (composed of more than one column) primary key, because two columns, OrderID and ProductID, are required to uniquely identify each row.

We are simulating keyword spamming by saying that truck appears six times in D2. This is exactly how spamming is accomplished: have a term show up in a document many, many times. It is usually even more than six times, but that is good enough for our example. Table 12.4 is generated exactly as table 12.1 was and shows our base calculations. As we promised, things are a little simpler.

You create a SqlCommand object using the default constructor and print a message indicating you ve created it: 'create command Dim cmd As SqlCommand = New SqlCommand Console.WriteLine("Command created.") In this example, the command is empty. It isn t associated with a connection, and it doesn t have its text (in other words, the SQL) set. You can t do much with it here, so let s move on and see how you can associate a command with a connection.

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