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  1. Prepare
  2. SQL
  3. Basic Join
  4. Population Census
  5. Discussions

Population Census

  • michaelfernando3
     + 0 comments
    SELECT SUM(POPULATION)
FROM CITY
WHERE COUNTRYCODE IN (
    SELECT CODE
    FROM COUNTRY
    WHERE CONTINENT = 'Asia')

    we can use the Where statement to match the Country code keys