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10 rows selected. SQL> If you also want to see all course offerings with an unknown trainer, you can change the solution as follows: Solution 8-1b. Second Solution, Also Showing Course Offerings with Unknown Trainers SQL> 2 3 4 5 6 7 8 9 10 11 12 CODE ---ERM JAV JAV OAU OAU PLS PRO RSD SQL SQL select , , , DISTINCT c.code o.begindate c.duration case when o.trainer is not null then e.ename else null end as trainer employees e courses c offerings o coalesce(o.trainer,-1) in (e.empno,-1) o.course = c.code;

view is not used the off-screen text box below is empty the slide area becomes the single place to hold both spoken words and projected images.

Rather than hard-coding printing routines for each of the 20 kinds of messages, you can create a handful of routines that print each of the primary data types floating point, integer, character string, and so on. You can describe the contents of each kind of message in a table (including the name of each field) and then

decode each message based on the description in the table. A table entry to describe one kind of message might look like this:

BEGINDATE DURATION TRAINER ----------- -------- -------15-JAN-2001 3 13-DEC-1999 4 JONES 01-FEB-2000 4 ADAMS 10-AUG-1999 1 JONES 27-SEP-2000 1 FORD 11-SEP-2000 1 SCOTT 19-FEB-2001 5 24-FEB-2001 2 SCOTT 12-APR-1999 4 FORD 04-OCT-1999 4 SMITH

Message Begin NumFields 5 MessageName "Buoy Temperature Message" Field 1, FloatingPoint, "Average Temperature" Field 2, FloatingPoint, "Temperature Range" Field 3, Integer, "Number of Samples" Field 4, String, "Location" Field 5, TimeOfDay, "Time of Measurement" Message End

Placing all information on the slide area results in an overwhelming amount of information on the slide.

This table could be hardcode in the program (in which case each of the elements shown would be assigned to variables), or it could be read from a file at program startup time or later. Once message definitions are read into the program, instead of having all the information embedded in a program s logic you have it embedded in data. Data tends to be more flexible than logic. Data is easy to change when a message format changes. If you have to add a new kind of message, you can just add another element to the data table. Here s the pseudocode for the top-level loop in the table-driven approach:

13-DEC-1999 03-FEB-2000 18-SEP-2000

The first three lines here are the same as in the logicbased approach. While more messages to read Read a message header Decode the message ID from the message header Look up the message description in the message-description table Read the message fields and print them based on the message description End While

When the text on screen is the same as what is narrated, it creates redundancy that reduces understanding. The busy slide splits attention from the speaker s narration.

Unlike the pseudocode for the logic-based approach, the pseudocode in this case isn t abbreviated because the logic is so much less complicated. In the logic below this level, you ll find one routine that s capable of interpreting a message description from the message description table, reading message data, and printing a message. That routine is more general than any of the logic-based message-printing routines but not much more complicated, and it will be one routine instead of 20:

13 rows selected. SQL> Line 11 might look curious at first sight. It relaxes the join between OFFERINGS and EMPLOYEES a bit. Instead of 1, you can use any other arbitrary numeric value, as long as it could not be an existing employee number. Note also that this trick makes the addition of DISTINCT necessary. 2. Provide an overview, in two columns, showing the names of all employees who ever attended an SQL course, with the name of the trainer. Solution 8-2. SQL> 2 3 4 5 6 7 8 9 10 select a.ename as attendee , t.ename as trainer from employees t join offerings o on (o.trainer = t.empno) join registrations r using (course, begindate) join employees a on (r.attendee = a.empno) where course = 'SQL'; TRAINER -------FORD FORD FORD FORD SMITH SMITH SMITH SMITH SMITH

While more fields to print Get the field type from the message description case ( field type ) of ( floating point ) read a floating-point value print the field label print the floating-point value