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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'
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Hackerrank | MySQL | Revising Aggregations - The Count Function (0) | 2020.08.28 |
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