Example
List employees earning more than $50000 born this century. List their name, date of birth and salary, sorted alphabetically by name.
SELECT employee_name, date_of_birth, salary
FROM employees
WHERE salary > 50000
AND date_of_birth >= DATE '2000-01-01'
ORDER BY employee_name;
Show the number of employees in each department with at least 5 employees. List the largest departments first.
SELECT department_id, COUNT(*)
FROM employees
GROUP BY department_id
HAVING COUNT(*) >= 5
ORDER BY COUNT(*) DESC;
