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Hackerrank | MySQL | Revising Aggregations - Averages 본문
Revising Aggregations - Averages
Revising Aggregations - Averages | HackerRank
Query the average population of all cities in the District of California.
www.hackerrank.com
Query the average population of all cities in CITY where District is California.
SELECT AVG(population)
FROM city
WHERE district = 'California''데이터분석 > practice_query' 카테고리의 다른 글
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| Hackerrank | MySQL | Revising Aggregations - The Count Function (0) | 2020.08.28 |
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