MySQL嵌套查询语句

SELECT District,NAME,Population FROM city WHERE Population IN (SELECT MIN(Population) FROM city 
WHERE city.CountryCode=‘CHN‘
GROUP BY city.District)
UNION
SELECT District,NAME,Population FROM city WHERE Population IN (SELECT MAX(Population) FROM city 
WHERE city.CountryCode=‘CHN‘
GROUP BY city.District)

MySQL嵌套查询语句

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