In evaluating a postfix expression, when an equal sign (=) is encountered, how many elements must the stack contain so that no error is generated?
A. none
B. one
C. two
D. three
Answer: B
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A. @ B. / C. -- D. !
You have a file that is not empty, and you want to preserve the contents and append to the end of the file. Give the commands necessary to open a file for appending.
What will be an ideal response?
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Indicate whether the statement is true or false
Which of the following statements best describes the DUAL table?
A. Table with one column and one row used in various operations B. Dictionary view containing two index names C. Table with two columns and no rows used in various operations D. Dictionary view containing two schema names