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Revising Aggregations - Averages
Revising Aggregations - Averages
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SELECT AVG(POPULATION) FROM CITY WHERE DISTRICT = 'California'
MySQL solution:
select avg(population) from city where district='california';
Oracle SQL
select avg(population) from CITY where district = 'California';
SELECT AVG(POPULATION) AS AVERAGE_POPULATION FROM CITY WHERE DISTRICT = 'California';