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Two ways that work in Oracle:
SELECT SUM(cty.POPULATION) FROM CITY cty, COUNTRY cry WHERE cty.COUNTRYCODE = cry.CODE AND cry.CONTINENT = 'Asia';
SELECT SUM(cty.POPULATION) FROM CITY cty JOIN COUNTRY cry ON cty.COUNTRYCODE = cry.CODE WHERE cry.CONTINENT = 'Asia';
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Population Census
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Two ways that work in Oracle: