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1. Look at the example discussed in Listings 10-7, 10-8, and 10-9. Rewrite the query in Listing 10-9 without using a view, by using the WITH operator. Solution 10-1. Listing 10-9 Rewritten to Use the WITH Operator SQL> 2 3 4 5 6 7 8 9 10 11 12 13 with course_days as (select e.empno, e.ename , sum(c.duration) as days from registrations r , courses c , employees e where e.empno = r.attendee and c.code = r.course group by e.empno, e.ename) select * from course_days where days > (select avg(days) from course_days); ENAME DAYS -------- -------ALLEN 11 BLAKE 12 SCOTT 12 KING 8 ADAMS 9 FORD 9

programming experience would be able to edit templates with his or her existing skill set. If not, there s too much programmatic complexity in the templates.

2. Look at Listing 10-12. How is it possible that you can delete employee 7654 via this EMP view There are rows in the HISTORY table, referring to that employee via a foreign key constraint. Answer: You can delete that employee because you created the foreign key constraint with the CASCADE DELETE option, so all corresponding HISTORY rows are deleted implicitly. 3. Look at the view definition in Listing 10-18. Does this view implement the foreign key constraints from the REGISTRATIONS table to the EMPLOYEES and COURSES tables Explain your answer. Answer: No, it doesn t. The view checks insertions and updates, but it doesn t prevent you from deleting any rows from the EMPLOYEES and COURSES tables; that is, the view implements only one side of those foreign key constraints.

A template is an empty database model. It has predefined field names and data types that you can use to create new instances of a database. An experienced administrator who has overseen many database deployments will find some characteristics of his or her databases to be common, and therefore appropriate for inclusion into a template. Although Concordance ships with a handful of templates already, you re free to create new templates as needed. Templates are meant to be the most generic instance of a database project, and you ll most likely have to modify fields in a template during a deployment. Modifying fields in an instance of a database built from a template doesn t modify the original template itself. Database template files are stored in the Dataflight\Concordance\Templates folder. Any subfolder created under the Dataflight\Concordance\Templates folder will create a new tab on the Create database from template popup dialog, allowing you to add further organization to similar templates. Compare the folder structure in Figure 5-7 to the tabs in the dialog shown in Figure 5-8.

The MVC pattern has proved itself resilient as a conceptual approach for user interface development. In order to ease your use of this conceptualization in your own use of Catalyst, we ll cover a little of the history of the pattern (see the sidebar A Brief History of MVC Software Design ) and provide an overview of how it s normally interpreted in Catalyst applications.

Tip Don t try to program your own referential integrity constraint checking. Your solution will probably overlook something, and it will always be less efficient than the declarative constraints of the Oracle DBMS.

Figure 5-8. Tabs on the Create database from template popup dialog are produced from the folders that have been created under the Concordance\Templates directory.

4. Create a SAL_HISTORY view providing the following overview for all employees, based on the HISTORY table: For each employee, show the hire date, the review dates, and the salary changes as a consequence of those reviews. Solution 10-4. The SAL_HISTORY View SQL> 2 3 4 5 6 7 8 9 10 11 create or replace view sal_history as select empno , min(begindate) over (partition by empno) as hiredate , begindate as reviewdate , msal - lag(msal) over (partition by empno order by empno, begindate) as salary_raise from history;