Classificando com ORDER BY

SQL does not guarantee the order of the rows returned by a SELECT: if you want a deterministic order, you have to ask for it explicitly with ORDER BY:

SELECT <colonne>
FROM   <tabella>
[WHERE <condizione>]
ORDER BY <colonna> [ASC|DESC] [, <altra-colonna> [ASC|DESC] …];

• ASC is the default: ascending order (1 → 9, A → Z, old → recent).
• DESC sorts descending (9 → 1, Z → A, recent → old).
• You can sort by multiple columns: the second criterion breaks ties of the first.

Examples

-- Dal più recente assunto al più vecchio:
SELECT first_name, last_name, hired_on
FROM employees
ORDER BY hired_on DESC;

-- Per dipartimento crescente, poi per stipendio decrescente:
SELECT *
FROM employees
ORDER BY department_id, salary DESC;

Try it

Review exercise