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SQL is such a common query language that very few realize that there were ever any others. In fact, few even comprehend the concept that there can be other languages than SQL. But there are others. Oracle Rdb supports SQL, but Rdb also supports a language called Relational Database Operator (RDO). (Yes, you ve heard it here: there was an RDO long before Microsoft took up that abbreviation). RDO is a language developed by Digital Equipment Corporation (DEC) for use in their own database management system. Oracle bought that system, and continues to support the use of RDO to this day.The Ingres database, once a competitor to Oracle, also had its own query language. Ingres originally supported a language known as Quel. That language did not compete well with SQL, and Ingres Corporation was eventually forced to build SQL support into their product.Today, SQL is the dominant database access language. All mainstream relational databases claim to support it. And yet, no two databases support it in quite the same way. Instead of completely different languages with dissimilar names, today we have variations that we refer to as Oracle SQL, Microsoft SQL, DB2 SQL, and so forth. The world really hasn t changed much.

Listing 10-7. Working Toward a Solution: Step 1 SQL> 2 3 4 5 6 7 8 select , , from e.empno e.ename sum(c.duration) as days registrations r join courses c on (c.code = r.course) join employees e on (e.empno = r.attendee) group by e.empno , e.ename; ENAME DAYS -------- -------JONES 3 ALLEN 11 WARD 1 JONES 5 BLAKE 12 CLARK 4 SCOTT 12 KING 8 TURNER 1 ADAMS 9 FORD 9 MILLER 4

EMPNO -------7900 7499 7521 7566 7698 7782 7788 7839 7844 7876 7902 7934

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12 rows selected. SQL> This is not the solution to our problem yet, but it is already quite complicated. We have a join and a GROUP BY clause over a combination of two columns. If the result in Listing 10-7 were a real table, our original problem would be much easier to solve. Well, we can simulate that situation by defining a view. So we add one extra line to the query in Listing 10-7, as shown in Listing 10-8. Listing 10-8. Working Toward a Solution: Step 2 SQL> 2 3 4 5 6 7 8 9 create or replace view course_days as select e.empno , e.ename , sum(c.duration) as days from registrations r join courses c on (c.code = r.course) join employees e on (e.empno = r.attendee) group by e.empno , e.ename;

The a-Order application s approach to access control is considerably simpler than what you saw in aExpense. Instead of combining authentication logic and business rules, a-Order simply annotates pages with roles in the Web.con g le.

The easiest way to create a chart in your business plan is to use existing data that is contained within a table in your document. To create a chart based on table data, select the chart by clicking inside it. Then click Table Select Table. Once you have selected the entire table, click Insert Picture Chart. Word launches Microsoft Graph, which automatically creates a chart based on your table. Additionally, Word adds two new menus, Data and Chart, to the menubar, as shown in Figure 2-38. These menus will help you manipulate your chart. The default chart type is a column chart. But you can change that. To do so, select your chart. Then click Chart Chart Type. The Chart Type dialog box provides you with a number of different chart styles, as you see in Figure 2-39. Simply select the type of chart you would like and click OK. Word returns you to your document and updates the chart automatically.

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