เลือกประเภท join ที่เหมาะสม

SELECT 
	c.name AS country,
    region,
    life_expectancy AS life_exp
FROM countries AS c
-- Join to populations (alias as p) using an appropriate join
___ 
ON c.code = p.country_code
-- Filter for only results in the year 2010
___
-- Sort by life_exp
___
-- Limit to five records
___;