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#案例:選中city在多倫多工作的員工
SELECT
last_name,job_id,e.department_id,department_name
FROM
employees AS e,departments AS d,locations AS l
WHERE
e.`department_id`=d.`department_id`
AND
d.`location_id`=l.`location_id`
AND
l.city='Toronto'
#案例;查詢每個國家下的部門個數大于2的國家編號
SELECT
country_id ,COUNT(*)
FROM
locations AS l,departments AS d
WHERE
l.`location_id`=d.`location_id`
GROUP BY
country_id
HAVING
COUNT(*) >2;
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