PL/SQL Online Quiz

Q 1 - Which of the following is true about the execution section of a PL/SQL block?

A - It is enclosed between the keywords BEGIN and END.

B - It is a mandatory section.

C - It consists of the executable PL/SQL statements.

D - All of the above.

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 - Which of the following is not true about labelling PL/SQL loops?

A - PL/SQL loops can be labelled.

B - The label should be enclosed by angle brackets (< and >).

C - The label name appears at the beginning of the LOOP statement.

D - The label name can also appear at the end of the LOOP statement or with an EXIT statement.

Q 4 - Which of the following is not true about the PL/SQL data structure VARRAY?

A - It is a fixed-size sequential collection of elements.

B - The elements can of various data types.

C - It is used to store an ordered collection of data.

D - Each element in a VARRAY has an index associated with it.

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.

Q 6 - Which of the following code correctly create a record named book with two field title and author?

A - TYPE book IS RECORD

(title  varchar(50),
    author  varchar(50),
    );

B - RECORD book

(title  varchar(50),
    author  varchar(50),
    );

C - CREATE RECORD book

(title  varchar(50),
    author  varchar(50),
    );

D - CREATE TYPE book

(title  varchar(50),
    author  varchar(50),
    );

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 - Which of the following statement will create the specification for a package named cust_sal

A -

CREATE PACKAGE BODY cust_sal AS
 PROCEDURE find_sal(c_id customers.id%type);
END cust_sal;

B -

CREATE PACKAGE cust_sal AS
 PROCEDURE find_sal(c_id customers.id%type);
END cust_sal;

C -

CREATE PACKAGE SPECIFICATION cust_sal AS
 PROCEDURE find_sal(c_id customers.id%type);
END cust_sal;

D -

PACKAGE cust_sal AS
 PROCEDURE find_sal(c_id customers.id%type);
END cust_sal;

Q 9 - Which of the following is not true about database transactions?

A - A database transaction is an atomic unit of work.

B - It may consist of one or more related SQL statements.

C - A successfully executed SQL statement and a committed transaction are not same.

D - None of the above.

Q 10 - The following code tries to create a base object named rectangle, which will be inherited. What is wrong in the code?

CREATE OR REPLACE TYPE rectangle AS OBJECT
(length number,
 width number,
 member function enlarge( inc number) return rectangle,
 NOT FINAL member procedure display) 

A - The declaration should read as CREATE OR REPLACE OBJECT rectangle AS …

B - The base object should not have any member attribute or functions.

C - The base object rectangle should be declared as NOT FINAL.

D - None of the above