To answer this question, let's go through the code step by step:

1. The statement set serveroutput on; enables the output display in Oracle.

2. The keyword declare is used to declare variables within the block.

3. The variables a and b of type int are declared.

4. The value of a and b are set to NULL.

5. The if statement checks if a is less than b. Since both a and b are NULL, the condition evaluates to NULL.

6. In Oracle, NULL is considered an unknown value. When comparing NULL with any other value, the result is always NULL.

7. The else part of the if statement is executed because the condition is not satisfied. It prints 'n' using the dbms_output.put_line function.

8. Finally, the end if; marks the end of the if statement.

Based on the above explanation, the correct answer is:

Option B) n

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To answer this question, we need to understand the concept of explicit cursor attributes in Oracle.

Explicit cursors are used to retrieve and manipulate data from a query. They have certain attributes that can provide information about the cursor. The available explicit cursor attributes in Oracle are:

A) %NOTFOUND - This attribute returns TRUE if the last fetch did not return a row, and FALSE otherwise.

B) %ROWCOUNT - This attribute returns the number of rows fetched so far from the cursor.

C) %ISOPEN - This attribute returns TRUE if the cursor is open, and FALSE otherwise.

D) %ISCLOSE - This attribute is not a valid explicit cursor attribute in Oracle. Therefore, option D is the correct answer.

The correct answer is D) %ISCLOSE, as it is not an explicit cursor attribute in Oracle.

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To answer this question, let's analyze the given SQL statement:

SELECT DECODE(empid,38475, "Terminated",60494, "LOA", "ACTIVE") FROM emp;

The DECODE function in SQL is used to compare an expression (in this case, empid) with a list of values and return a corresponding result.

In the given statement, the empid is compared to three values: 38475, 60494, and the default value "ACTIVE".

If the empid matches 38475, the result will be "Terminated". If the empid matches 60494, the result will be "LOA". If the empid does not match any of these values, the result will be "ACTIVE".

In this case, the empid selected is 60494. Therefore, the result of the statement will be "LOA".

So, the correct answer is B) LOA.

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To answer this question, we need to understand what happens to a nonunique index when a table is dropped.

Option A) No effect - This option is incorrect because dropping a table does have an effect on the index.

Option B) The index will be rendered invalid - This option is incorrect. When a table is dropped, the index is not rendered invalid. It is either dropped or remains intact.

Option C) The index will be dropped - This option is correct. When a table is dropped, all associated indexes are also dropped. This includes nonunique indexes created for the table.

Option D) The index will contain NULL values - This option is incorrect. Dropping a table does not affect the existing values in the index. Instead, the index itself is either dropped or remains intact.

The correct answer is C) The index will be dropped. This option is correct because when a table is dropped, all associated indexes, including nonunique indexes, are also dropped.

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