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In SQL the case shown in Example 9-4 does not actually require an explicit speci cation of tuple variables; the table name can be used as the tuple variable so that Employeeage and Childrenage can be used to distinguish between attributes having identical names In SQL the use of explicitly de ned tuple variables is needed only to avoid ambiguity This requirement often occurs with subqueries For instance, when a SELECT subquery in a WHERE clause has to refer to the same row as another SELECT clause, the tuple variables must be de ned with their table names in the FROM clause; the syntax is indicated in Table 9-1 The attribute is then written as tuple variableattribute Queries with two or more distinct rows instances of one relation cannot be formulated without the use of tuple variables Example 9-5 provides an example with a query where the boss and the subordinate are distinct entries in the same Employee 2 relation

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Example 9-5

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Solution to Exercise 18-2. Modify the first exercise by dragging a timer (found in the Components section of the Toolbox) onto the form and having the timer change the message from Hello to Goodbye and back once per second. Change the button to turn this behavior on and off. Use the Microsoft Help files to figure out how to use the timer to accomplish this exercise. Here are the steps you need to follow: 1. Create a new project named Exercise 18-2. 2. Set the form to the size of the form in Exercise 18-1 (213, 119). 3. Optionally copy the two controls (label and button) from the first exercise (or drag on new ones). 4. Set the form s text to Hello Goodbye . Set the Text of the button to Start . 5. Drag a Timer control from the Components section of the Toolbox onto the form. It won t show up on the form itself; it will appear in a special section at the bottom of the window called the tray, as shown in Figure A-6. 6. Set the timer s Interval property to 1,000 and its Enabled property to false. This ensures that the timer won t start until the button is clicked at least once. 7. Double-click on the timer to create the timer1_Tick event handler, which will fire every 1,000 milliseconds (every 1 second). 8. Add a Boolean property (which we ve called isHello) to the class, outside the methods, and initialize it to true. 9. Add the following code to the timer1_Tick handler. This code will alternate the text in the label by checking (and changing) the Boolean value isHello:

In order to form a table which contains all the employees who supervise other employees it is necessary to look at the Employee 2 row for the boss and the Employee 2 row for the subordinate at the same time The result table is to contain both names and the years of supervision Two tuple variables range independently over the employee table (see Fig 7-10 for the instance), so that given Supervision : RELATION Employee 2: RELATION super, sub : years; name : age, , experience;

private void timer1_Tick(object sender, EventArgs e) { isHello = !isHello; if (isHello) { label1.Text = "Hello"; } else

Unclustered Tree Index Using Alternative (2)

SELECT bossname, subordname, supervyears FROM Employee 2 boss, Employee 2 subord, Supervision superv WHERE bossname = supervsuper supervsub = subordname; In SQL the tuple variable superv

{ label1.Text = "Goodbye"; } }

9-2-3 Quanti cation In the examples up to now the WHERE clause contained an attribute expression The resulting boolean True or False value is used to control the result of SELECT expressions The boolean for the WHERE clause can also be obtained by asking about the result of a subquery in a quantitative sense We distinguish two types, referred to as existential and universal quanti cation Existential quanti cation is obtained through use of the EXISTS clause in SQL The EXISTS ( SELECT * ) clause is satis ed whenever there is any match in the SELECT * subquery Universal quanti cation is true only if all instances are true Universal quanti cation is not directly available in SQL but in most cases can be obtained by using NOT EXISTS applied to the complement of the condition The use in both types of quanti cation is shown in Example 9-6 Note that use of EXISTS produces a True-or-False condition for a row identi ed with a tuple variable, while there was a join implied in Example 9-4

10. Change the button1_Click event handler, adding the following code. This code will test whether the timer is running (if so, its IsEnabled property is true) to start the timer and set the button s text to Stop , or to stop the timer and set the button s text to Start :

Sec 9-2

private void button1_Click(object sender, EventArgs e) { if (!timer1.Enabled) { timer1.Start( ); this.button1.Text = "Stop"; } else { timer1.Stop( ); this.button1.Text = "Start"; } }

Example 9-6

The source code for this example is presented in Example A-54.

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