PL/SQL Online Quiz

Q 1 - Which of the following is not true about the execution section of a PL/SQL block?

A - It should have more than one executable line of code.

B - It may have just a NULL command to indicate that nothing should be executed.

C - The statements must always end with a semicolon.

D - The section may contain SQL commands, logical control commands, assignment commands, as well as other commands.

Q 2 - What is wrong in the following code?

DECLARE
   c_id := 1;
   c_name  customers.name%type;
   c_addr customers.address%type;
  BEGIN
   SELECT name, address INTO c_name, c_addr
   FROM customers
   WHERE id = c_id;
END;

A - You cannot use the SELECT INTO statement of SQL to assign values to PL/SQL variables.

B - The SELECT INTO statement here is wrong. It should be: SELECT c_name, c_address INTO name, addr

C - The WHERE statement is wrong. It should be: WHERE id := c_id;

D - The variable c_id should be declared as a type-compatible variable as −

c_id customers.id%type := 1;

Q 3 - What will be the output of the following code snippet?

DECLARE
   a number(3) := 100;
   b number(3) := 200;
BEGIN
   IF( a = 100 ) THEN
      IF( b <> 200 ) THEN
         dbms_output.put_line(b);
      END IF;
   END IF;
   dbms_output.put_line(a);
END;

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

B - 200

C - 200

     100

D - 100

Q 4 - A subprogram can be created −

A - At schema level.

B - Inside a package.

C - Inside a PL/SQL block.

D - All of the above.

Q 5 - What is wrong in the following code snippet?

CREATE OR REPLACE FUNCTION totalCustomers
total number(2) := 0;
BEGIN
   SELECT count(*) into total
   FROM customers;
   RETURN total;
END;

A - It doesn’t have the RETURN clause in function declaration.

B - The RETURN statement is wrong.

C - Function definition should not use the IS keyword

D - Nothing wrong.

Q 6 - Which of the following is the correct syntax for creating an explicit cursor?

A - CURSOR cursor_name IS select_statement;

B - CREATE CURSOR cursor_name IS select_statement;

C - CREATE CURSOR cursor_name AS select_statement;

D - CURSOR cursor_name AS select_statement;

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;

Which of the following holds true for the WHEN clause?

A - This provides a condition for rows for which the trigger would fire and this clause is valid only for row level triggers.

B - This provides a condition for rows for which the trigger would fire and this clause is valid only for table level triggers.

C - This provides a condition for rows for which the trigger would fire and this clause is valid only for view based triggers.

D - All of the above.

Q 8 - Any subprogram not in the package specification but coded in the package body is called a

A - Public object.

B - Private object.

C - None of the above.

D - Both of the above.

Q 9 - Which of the following code is the correct syntax for creating an index-by table named salary that will store integer values along with names and the name field will be the key?

A - TYPE salary IS TABLE OF NUMBER INDEX BY VARCHAR2(20);

B - CREATE TABLE salary OF NUMBER INDEX BY VARCHAR2(20);

C - TYPE salary IS INDEXED TABLE OF NUMBER INDEX BY VARCHAR2(20);

D - None of the above.

Q 10 - Which of the following is true about the inheritance for PL/SQL Objects?

A - PL/SQL allows creating object from existing base objects.

B - To implement inheritance, the base objects should be declared as NOT FINAL.

C - The NOT INSTANTIABLE clause allows you to declare an abstract object.

D - All of the above.