Notes
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AVG(salary) - STDDEV(salary) AS SAL_MIN
AVG(salary) + STDDEV(salary) AS SAL_MAX
FROM hr.employees JOIN hr.departments USING (department_id)
GROUP BY department_id)
SELECT first_name, last_name, dep_name, salary, sal_min, sal_max
FROM hr.employees JOIN dep_kpis USING (department_id)
WHERE salary BETWEEN sal_min AND sal_max;
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