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Listing 8-1. Using Tuple Variables in a Query select e.ename, e.init, e.job from employees e 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.

The simplest one is to have the user help out In step 2, when Alice s browser is redirected to your local ADFS, it pauses the protocol and displays a Web page to Alice, asking her what company she works for (Note that it doesn t help Alice to lie about this, because her credentials are only good for one of the companies on the list her company) Alice clicks the link for her company and the protocol continues, since the issuer now knows what to do To avoid asking Alice this question in the future, your issuer sets a cookie in her browser so that next time it ll know who her issuer is without having to ask The second way to solve this problem is by adding a hint to the query string that s in the link that Alice clicks in step 1.

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Tip For more flexibility in choosing where to insert rows and columns, use the Insert submenu on the

Figure 8-1. The EMPLOYEES table with a tuple variable 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. 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. 3.

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. For each row in the intermediate result set, the expressions in the SELECT clause are evaluated to produce the final query result.

Figure 8-2. Calendar with sliding day indicator window 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.

That query string will contain a parameter named whr (hr stands for home realm) The issuer (ADFS 20) looks for this hint and automatically maps it to the URL of the user s home realm This means that the issuer doesn t have to ask Alice who her issuer is because the application relays that information to the issuer The issuer uses a cookie, just as before, to ensure that Alice is never bothered with this question..

To remove rows or columns, select the row or column you would like to delete. Then click Table Delete and select what to delete.

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 select deptno, location, ename, init from employees, departments; select deptno, location, ename, init * ERROR at line 1: ORA-00918: column ambiguously defined

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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