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This chapter is from the book

In order to test your progress, you should be able to answer the following questions.

1)

If a variable is declared as follows, what are the results?


v_fixed_amount CONSTANT NUMBER;
  1. _____ A NUMBER variable called v_fixed_amount has been declared (it will remain as a constant once initialized).

  2. _____ A NUMBER variable called v_fixed_amount has been declared (it will remain as null).

  3. _____ An error message will result because constant initialization must be done in the executable section of the block.

  4. _____ An error message will result because the declaration for the CONSTANT is missing an assignment to a NUMBER.

2)

Which of the following are valid character types for PL/SQL?

  1. _____ Numbers

  2. _____ English letters

  3. _____ Paragraph returns

  4. _____ Arithmetic symbols

  5. _____ Japanese Kanji

3)

A variable may be used for which of the following?

  1. _____ To hold a constant, such as the value of π

  2. _____ To hold the value of a counter that keeps changing

  3. _____ To place a value that will be inserted into the database

  4. _____ To hold onto the function of an operand

  5. _____ To hold any value as long as you declare it

4)

Which of the following will declare a variable that is of the identical data type as the student_id in the database table STUDENT in the CTA database?

  1. _____ v_id student_id := 123;

  2. _____ v_id binary integer;

  3. _____ v_id numberNUMBER := 24;

  4. _____ v_id student_id%type;

5)

The value of a variable is set to null after the 'end;' of the block is issued.

  1. _____ True

  2. _____ False

Answers appear in Appendix A, Section 3.1.

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