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This article mainly gives you a brief talk about the use of MySQL nested query cases, related professional terms you can check the Internet or find some related books to supplement, here do not dabble in, straight to the topic, hoping to bring you some practical help.

For example:

MySQL nested query statement counts the most populous and least populous cities in each province

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

GROUP BY city.District)

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