SET SERVEROUTPUT ON;

DECLARE
    num INTEGER := 12; 
    is_even BOOLEAN;

    FUNCTION is_even_or_odd_012(num IN INTEGER) RETURN BOOLEAN IS
    BEGIN
        IF MOD(num, 2) = 0 THEN
            RETURN TRUE; 
        ELSE
            RETURN FALSE; 
        END IF;
    END is_even_or_odd_012;
BEGIN
    is_even := is_even_or_odd_012(num);
    IF is_even THEN
        DBMS_OUTPUT.PUT_LINE(num || ' is even.');
    ELSE
        DBMS_OUTPUT.PUT_LINE(num || ' is odd.');
    END IF;
END;
/
by

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About PL/SQL

PL/SQL is procedural extension for SQL created by Oracle. It is by default embedded into the Oracle Database. PL/SQL program units are compiled and stored inside the Oracle Database which results in optimal execution times as the PL/SQL and SQL run within the same server process.

Syntax help

Following is the syntax structure for the PL/SQL code blocks

DECLARE 
   <declarations section> 
BEGIN 
   <executable command(s)>
EXCEPTION 
   <exception handling> 
END;

Example

DECLARE 
   message  varchar2(100):= 'Hello, World!'; 
BEGIN 
   dbms_output.put_line(message); 
END; 
/

Named procedures

CREATE OR REPLACE FUNCTION 
hello_user
   (user_name IN VARCHAR2) 
    RETURN VARCHAR2
IS
BEGIN
   RETURN 'Hello ' || user_name;
END hello_user;
/

BEGIN
   dbms_output.put_line(hello_user('Peter'));
END;
/

Exception handling

BEGIN
  DBMS_OUTPUT.put_line (1/0);
EXCEPTION
  WHEN OTHERS
  THEN
    DBMS_OUTPUT.put_line ('error is: ' || SQLERRM);
END;