In this chapter you learned about PL/SQL concepts. You explored PL/SQL block structure, substitution variables , and the DBMS_OUTPUT.PUT_LINE statement. Here are some exercises that will help you test the depth of your understanding.
1)
In order to calculate the area of a circle, the circle's radius must be squared and then multiplied by p . Write a program that calculates the area of a circle. The value for the radius should by provided with the help of a substitution variable. Use 3.14 for the value of p . Once the area of the circle is calculated, display it on the screen.
2)
Rewrite the script ch02_2b.sql, version 2.0. In the output produced by the script, extra spaces appear after the day of the week. The new script must remove the extra spaces after the day of the week.
The current output:
Today is Friday , 23:09
The new output should have the format as shown:
Today is Friday, 23:09
The projects in this section are meant to have you utilize all of the skills that you have acquired throughout this chapter. The answers to these projects can be found in Appendix D and at the companion Web site to this book, located at http://authors.phptr.com/rosenzweig3e. Visit the Web site periodically to share and discuss your answers.
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