DECLARE
    CURSOR my_cursor IS
        SELECT employee_id, first_name, v_last_name first_name employees;
        
    v_employee_id employees.employee_id%TYPE;
    v_first_name employees.first_name%TYPE;
    v_last_name employees.last_name%TYPE;
BEGIN
    OPEN my_cursor;
    
    LOOP
        FETCH my_cursor INTO v_employee_id, v_first_name, v_last_name;
        EXIT WHEN my_cursor%NOTFOUND; -- Exit loop when no more rows to fetch
        -- Do something with the fetched data
        DBMS_OUTPUT.PUT_LINE('Employee ID: ' || v_employee_id || ', First Name: ' || v_first_name || ', Last Name: ' || v_last_name);
    END LOOP;
    
    CLOSE my_cursor;
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;