PL/SQL Online Quiz

Answer : A

Q 2 - Consider the following code −

DECLARE
   -- Global variables 
   num number := 95; 
BEGIN 
   dbms_output.put_line('num: ' || num1);
   DECLARE 
      -- Local variables
      num number := 195; 
     BEGIN 
      dbms_output.put_line('num: ' || num1);
     END; 
END;

What will happen when the code is executed?

A - It won’t execute, it has syntax error

Answer : B

Q 3 - Which of the following is true about the following code snippet?

DECLARE
   a number(3) := 100;
BEGIN
   IF (a = 50 ) THEN
      dbms_output.put_line('Value of a is 10' );
   ELSEIF ( a = 75 ) THEN
      dbms_output.put_line('Value of a is 20' );
   ELSE
       dbms_output.put_line('None of the values is matching');
   END IF;
   dbms_output.put_line('Exact value of a is: '|| a ); 
END;

A - It has syntax error.

B - It will print 'None of the values is matching'.

C - It will print

None of the values is matching

Exact value of a is: 100

D - None of the above.

Answer : A

Explanation

the ELSIF statement is wrongly written as ELSEIF

Q 4 - Consider the following code snippet: how many times the loop will run?

DECLARE
   a number(2);
BEGIN
   FOR a in 10 .. 20 LOOP
       END LOOP;
END;

Answer : A

Q 5 - Which of the following is not true about PL/SQL cursors?

A - A cursor is a view on a table.

B - A cursor holds the rows (one or more) returned by a SQL statement.

C - The set of rows the cursor holds is referred to as the active set.

D - None of the above.

Answer : A

Explanation

A cursor is a memory area, known as context area, for processing an SQL statement, which contains all information needed for processing the statement.

Q 6 - Which of the following code will successfully declare an exception named emp_exception1 in a PL/SQL block?

A - EXCEPTION emp_exception1;

B - emp_exception1 EXCEPTION;

C - CREATE EXCEPTION emp_exception1;

D - CREATE emp_exception1 AS EXCEPTION;