PL/SQL Online Quiz

Answer : B

Q 2 - What would be printed when the following code is executed?

DECLARE
      x   NUMBER;
    BEGIN
      
       x := 5;
       x := 10;
       dbms_output.put_line(-x);
       dbms_output.put_line(+x);
       x := -10;
       dbms_output.put_line(-x);
       dbms_output.put_line(+x);
   END;

Answer : A

Q 3 - What is the output of the following code?

DECLARE
   grade char(1) := 'B';
BEGIN
   case 
      when grade = 'A' then dbms_output.put_line('Excellent');
      when grade = 'B' then dbms_output.put_line('Very good');
      when grade = 'C' then dbms_output.put_line('Well done');
      when grade = 'D' then dbms_output.put_line('You passed');
      when grade = 'F' then dbms_output.put_line('Better try again');
      else dbms_output.put_line('No such grade');
   end case;
END;

A - It has syntax error, so there will not be any output.

B - B

C - Very good

D - No such grade

Answer : C

Q 4 - Consider a variable named greetings declared as −

greetings varchar2(11) := 'Hello World';

What will be the output of the code snippet

dbms_output.put_line ( SUBSTR (greetings, 7, 5));

A - World

B - Hello

C - orld

D - None of the above.

Answer : A

Q 5 - Observe the following code and fill in the blanks −

DECLARE 
   total_rows number(2);
BEGIN
   UPDATE employees
   SET salary = salary + 500;
   IF ____________ THEN
      dbms_output.put_line('no employees selected');
   ELSIF ___________ THEN
      total_rows := _____________;
      dbms_output.put_line( total_rows || ' employees selected ');
   END IF; 
END;

A - %notfound, %found, %rowcount.

B - sql%notfound, sql%found, sql%rowcount.

C - sql%found, sql%notfound, sql%rowcount.

D - %found, %notfound, %rowcount.

Answer : B

Q 6 - The pre-defined exception CASE_NOT_FOUND is raised when

A - None of the choices in the WHEN clauses of a CASE statement is selected, and there is no ELSE clause.

B - PL/SQL has an internal problem.

C - A cursor fetches value in a variable having incompatible data type.

D - None of the above.

Answer : A

Q 7 - Observe the syntax given below −

CREATE [OR REPLACE ] TRIGGER trigger_name 
{BEFORE | AFTER | INSTEAD OF } 
{INSERT [OR] | UPDATE [OR] | DELETE} 
[OF col_name] 
ON table_name 
[REFERENCING OLD AS o NEW AS n] 
[FOR EACH ROW] 
WHEN (condition)  
DECLARE
   Declaration-statements
BEGIN 
   Executable-statements
EXCEPTION
   Exception-handling-statements
END;

The optional [FOR EACH ROW] clause specifies

A - A table with index.

B - A table with primary key.

C - A row level trigger.

D - A table with a unique key.