Oracle® PL/SQL® Interactive Workbook, Second Edition By Benjamin Rosenzweig, Elena Silvestrova
Table of Contents
Appendix A. Answers to Self-Review Questions
Lab 18.1 Self-Review Answers
A1:
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Comments
1)
A
A2:
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2)
C
You will recall that a following is always used in an index-by table declaration
INDEX BY BINARY_INTEGER;
A3:
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3)
A
A nested table is automatically NULL when it is declared. As a result, it must be initialized prior to its use.
A4:
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4)
C
If a PL/SQL table contains only one element, it is its first and last element. As a result, the FIRST method returns the subscript of the first element, 1, and the LAST method returns the subscript of the last element, 1.
A5:
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5)
C
It is important to remember that a PL/SQL table in this case is a nested table. You will recall that the DELETE method cannot be used with a nested table.
Lab 18.2 Self-Review Answers
A1:
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1)
A
You will recall that using a DELETE method on varrays causes a syntax error because varrays are dense.
A2:
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2)
B
A varray can contain a number of elements, varying from zero (empty array) to its maximum size. In other words, an upper bond of the array can be extended to its maximum size.
A3:
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3)
A
A4:
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4)
C
The COUNT method returns the current number of varray elements, and the LIMIT method returns the maximum number of elements that a varray can contain.
A5:
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5)
D
Because varrays cannot be sparse, a DELETE method causes a syntax error when it is issued against a varray.
Lab 18.3 Self-Review Answers
A1:
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1)
A
A2:
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2)
B
Regardless of its element type, an upper bound of a varray can be extended to its maximum size.
A3:
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3)
B
A nested table must be initialized prior to its use regardless its element data type.
