DECLARE message varchar2(100):= 'Hello, World!'; BEGIN dbms_output.put_line(message); END; /
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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.
Following is the syntax structure for the PL/SQL code blocks
DECLARE 
   <declarations section> 
BEGIN 
   <executable command(s)>
EXCEPTION 
   <exception handling> 
END;DECLARE 
   message  varchar2(100):= 'Hello, World!'; 
BEGIN 
   dbms_output.put_line(message); 
END; 
/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;
/BEGIN
  DBMS_OUTPUT.put_line (1/0);
EXCEPTION
  WHEN OTHERS
  THEN
    DBMS_OUTPUT.put_line ('error is: ' || SQLERRM);
END;