-- https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/Lexical-Conventions.html
SELECT last_name,salary*12,MONTHS_BETWEEN(SYSDATE,hire_date) 
  FROM employees
  WHERE department_id = 30
  ORDER BY last_name;
SELECT last_name,
  salary * 12,
        MONTHS_BETWEEN( SYSDATE, hire_date )
FROM employees
WHERE department_id=30
ORDER BY last_name;