Revising Aggregations - Averages

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    SELECT AVG(POPULATION) FROM CITY WHERE DISTRICT = 'California'

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    MySQL solution:

    SELECT AVG(POPULATION)
    FROM CITY
    WHERE DISTRICT LIKE 'California';
    
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    select avg(population) from city where district='california';

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    Oracle SQL

    select avg(population) from CITY where district = 'California';

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    SELECT AVG(POPULATION) AS AVERAGE_POPULATION FROM CITY WHERE DISTRICT = 'California';