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7 If you look at your Design pane now, you will see the icon for the embedded video, as shown in Figure 3-41 Save your page, and then choose File | Preview in Browser | Browser In the browser, your page will look something like Figure 3-42 If you have a blog, the process is basically the same Make sure to put the embed tags specific to your blog interface and paste the code

Until now, we have formulated our SQL statements as follows: SQL> select ename, init, job 2 from employees 3 where deptno = 20 Actually, this statement is rather incomplete. In this chapter, we must be a little more precise, because the SQL commands are getting slightly more complicated. To be complete and accurate, we should have written this statement as shown in Listing 8.1. Listing 8-1. Using Tuple Variables in a Query SQL> select e.ename, e.init, e.job 2 from employees e 3 where e.deptno = 20 In this example, e is a tuple variable. Tuple is just a dignified term for row, derived from the relational theory. In Oracle, tuple variables are referred to as table aliases (which is actually rather confusing), and the ANSI/ISO standard talks about correlation names. Note the syntax in Listing 8-1: you declare the tuple variable in the FROM clause, immediately following the table name, separated by white space only. A tuple variable always ranges over a table, or a table expression. In other words, in the example in Listing 8-1, e is a variable representing one row from the EMPLOYEES table at any time. Within the context of a specific row, you can refer to specific column (or attribute) values, as shown in the SELECT and WHERE clauses of the example in Listing 8-1. The tuple variable precedes the column name, separated by a period. Figure 8-1 shows the column reference e.JOB and its value ADMIN for employee 7900.

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Light emitting diodes (LEDs) have garnered recent attention because of their ease of use and popularity as activation sources for aminolevulinic acid (ie, photodynamic therapy) These devices emit noncoherent light of either one primary wavelength or of a short range of wavelengths Unlike the previously mentioned instruments, LEDs do not operate by the theory of selective photothermolysis LEDs operate on the

FIGURE 3-41

Do you remember those old-fashioned calendars with one page per month, with a transparent strip that could move up and down to select a certain week, and a little window that could move on that strip from the left to the right to select a specific day of the month If not, Figure 8-2 shows an example of such a calendar. The transparent strip would be the tuple variable in that metaphor.

Figure 8-2. Calendar with sliding day indicator window Using the concept of tuple variables, we can describe the execution of the SQL command in Listing 8-1 as follows: 1. The tuple variable e ranges (row by row) over the EMPLOYEES table (the row order is irrelevant). 2. Each row e is checked against the WHERE clause, and it is passed to an intermediate result set if the WHERE clause evaluates to TRUE. 3. For each row in the intermediate result set, the expressions in the SELECT clause are evaluated to produce the final query result. As long as you are writing simple queries (as we have done so far in this book), you don t need to worry about tuple variables. The Oracle DBMS understands your SQL intentions anyway. However, as soon as your SQL statements become more complicated, it might be wise (or even mandatory) to start using tuple variables. Tuple variables always have at least one advantage: they enhance the readability and maintainability of your SQL code.

FIGURE 3-42

FIGURE 24-6 A The IPL device can result in rectangular-shaped striped areas These are treated by turning the handpiece 90 degrees for the next treatment B Closer view of striping from the IPL This occurs most commonly on the legs and chest

You can specify multiple tables in the FROM component of a query. We start this section with an intended mistake, to evoke an Oracle error message. See what happens in Listing 8-2 where our intention is to discover which employees belong to which departments. Listing 8-2. Ambiguously Defined Columns SQL> select deptno, location, ename, init 2 from employees, departments; select deptno, location, ename, init * ERROR at line 1: ORA-00918: column ambiguously defined SQL> The message, including the asterisk (*), reveals the problem here. The Oracle DBMS cannot figure out which DEPTNO column we are referring to. Both tables mentioned in the FROM clause have a DEPTNO column, and that s why we get an error message.

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