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These exercises assume you have access to a database schema with the seven case tables (see Appendix A of this book). You can download the scripts to create this schema from this book s catalog page on the Apress website. The exact URL is: http://apress.com/book/view/1430271970. Look in the Book Resources section of the catalog page for a link to the download. When you re done with the exercises, check your answers against ours. We give our answers in Appendix B. 1. 2. 3. 4. 5. 6. 7. 8. 9. Provide the code and description of all courses with an exact duration of four days. List all employees, sorted by job, and per job by age (from young to old). Which courses have been held in Chicago and/or in Seattle Which employees attended both the Java course and the XML course (Provide their employee numbers.) List the names and initials of all employees, except for R. Jones. Find the number, job, and date of birth of all trainers and sales representatives born before 1960. List the numbers of all employees who do not work for the training department. List the numbers of all employees who did not attend the Java course. Which employees have subordinates Which employees don t have subordinates

Then we can create the Module::Pluggable::Object object, telling it to search only that namespace, and ask it for the list of available plug-ins. This goes away and searches @INC (which in a checkout will include lib/) for all .pm files whose package names should match the search path. Currently, the only one it s going to pick up is LOLCAT.pm, but as we add additional drivers it will find those as well. + + + my %translators; foreach my $class (@classes) { Class::MOP::load_class($class);

Figure 8-22. Global Replace tool. You can modify the contents of one or more fields over a set of records by highlighting field names in the list box.

10. Produce an overview of all general course offerings (course category GEN) in 1999. 11. Provide the name and initials of all employees who have ever attended a course taught by N. Smith. Hint: Use subqueries, and work inside out toward the result; that is, retrieve the employee number of N. Smith, search for the codes of all courses he ever taught, and so on. 12. How could you redesign the EMPLOYEES table to avoid the problem that the COMM column contains null values meaning not applicable 13. In Section 4.9, you saw the following statement: In SQL, NOT is not not. What is this statement trying to say 14. At the end of Section 4.5, you saw the following statement. The following two queries are logically equivalent: select * from employees where NOT (ename = 'BLAKE' AND init = 'R') select * from employees where ename <> 'BLAKE' OR init <> 'R' Prove this, using a truth table. Hint: Use P as an abbreviation for ename = 'BLAKE', and use Q as an abbreviation for init = 'R'.

This chapter is a logical continuation of the previous chapter. The main topic is still retrieval. It introduces functions and regular expressions, which enable you to formulate more powerful and complicated queries in an easy way. Oracle supports an abundance of functions. Apart from the various ANSI/ISO SQL standard functions, many Oracle-specific functions have been added to Oracle s SQL implementation over the years. The chapter begins with an overview of the seven categories of functions: arithmetic, text, regular expression, date, general, conversion, and group. The remaining sections discuss each type, with the exception of group functions, which are introduced in 8. You will also learn about regular expressions, which are used with some text functions to search for certain patterns in text. The last section of this chapter briefly explains how you can define your own SQL functions in Oracle, using the PL/SQL programming language.

Available fields are listed in a list box on the left-hand side of the tool. You may select one or more fields; to select multiple fields, you should press the Ctrl key, and keep it depressed as you select field names. The Target field represents the text that is to be replaced. In the fields that are to be updated, note that only the text that appears in this field is modified. Thus, if you enter the letter S here and no replacement value is provided in the Replacement field, the value Smith will be updated to mith.

Class::MOP is the core metaobject protocol that Moose is built on top of. It also provides some low-level but extremely handy utility functions. load_class will work out what to require() to get the class loaded. + (my $name = $class) =~ s/^\Q${base}::\E//;