What would be the result of the following DECODE function? DECODE(‘B’, ‘A’, ‘One’, ‘E’, ‘Five’, ‘I’, ‘Nine’, ‘O’, ‘Fifteen’, ‘U’, ‘Twenty-one’, ‘N/A’ )

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  1. One

  2. N/A

  3. Two

  4. Five

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Correct Option: B

AI Explanation

To answer this question, we need to understand how the DECODE function works.

The DECODE function in SQL is used to perform conditional logic within a query. It takes multiple pairs of values and returns a result based on the comparison of an expression with each pair.

In the given DECODE function:

DECODE('B', 'A', 'One', 'E', 'Five', 'I', 'Nine', 'O', 'Fifteen', 'U', 'Twenty-one', 'N/A')

The expression being compared is 'B'.

The DECODE function compares the expression 'B' with each pair of values. If the expression 'B' matches the first value of a pair, then the function returns the second value of that pair.

Let's go through each pair:

  1. ('A', 'One'): The expression 'B' does not match 'A', so this pair is not considered.
  2. ('E', 'Five'): The expression 'B' does not match 'E', so this pair is not considered.
  3. ('I', 'Nine'): The expression 'B' does not match 'I', so this pair is not considered.
  4. ('O', 'Fifteen'): The expression 'B' does not match 'O', so this pair is not considered.
  5. ('U', 'Twenty-one'): The expression 'B' does not match 'U', so this pair is not considered.
  6. ('N/A'): This is the default pair, which is considered when no other pairs match the expression. Since the expression 'B' does not match any of the previous pairs, the function returns 'N/A'.

Therefore, the result of the given DECODE function is 'N/A', which corresponds to Option B.

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