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So the solution to the quadratic equation x 2 + 3 x 10 = 0 is x = 2 or x = 5 Yet another way to solve quadratic equations is to use the quadratic formula If the quadratic equation is given in the form ax2 + bx + c = 0, then the quadratic formula can be applied in every instance by plugging the coef cients into: x= b b2 4 ac 2a

Notice in Figure 20-10 that the Student table columns are listed in the top pane, and you can choose to use all the columns or just specific columns from that pane by checking the appropriate check boxes When you make your choices (for this example, choose Student#, FirstName, LastName, and Program#), the SQL statement in the third pane down reflects your choice, and in this case displays the following statement:

You can also specify the sort order and selection criteria in the second pane To test the command, right-click in the bottom pane and select Run The command will be run against the connection to the database, and the results will be shown in the bottom pane In this example (shown in Figure 20-10), we have asked that LastName be sorted ascending, then FirstName sorted within LastName We also specified that the FirstName must be equal to Jim As you can see in the figure, this command returned only one record where the first name is Jim The corresponding SQL statement has been generated for us:

Good security screening could detect WMD threats, although the devices are often difficult to identify A True B False

SELECT Student#, FirstName, LastName, Program# FROM Student WHERE (FirstName = 'Jim') ORDER BY LastName, FirstName

Once you have tested the command, click OK in the Query Builder, and click Next in the Data Adapter Configuration Wizard The wizard then uses the information that you provided to generate the desired command and connection statements You will be shown a window that verifies the success or failure of the exercise (see Figure 20-11) When you are satisfied with the results, click Finish You will be returned to your form Notice in Figure 20-12 that the form now has two objects associated with it sqlDataAdapter1 and sqlConnection1

Figure 20-12

Biological weapons often do not require a vast amount of material to impact a wide area or number of people A True B False

You have now created two objects that represent the execution instructions and the physical connection to the data store The next step is to create an object that will represent the data a DataSet There are two ways to accomplish this: Select Data | Generate Dataset from the menus Right-click on the sqlDataAdapter1 object and select Generate Dataset In either case the Generate Dataset dialog box will be displayed (see Figure 20-13) You can select either an existing dataset or create a new object For this example, choose a new DataSet object and call it dsStudent to represent the table from which the data is retrieved The new DataSet object (dsStudent1) is created and added to the form along with the DataAdapter and Connection objects (at the bottom of the screen) EXAM TIP To summarize, you use an xxxDataAdapter (where xxx represents SQL or OLE), which encapsulates Connection, Command, and DataReader objects in order to populate a DataSet The DataSet is then used to represent the rows and columns (or a table) from the database Using the DataAdapter, you can update the data source through the DataSet