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The problem context involves determining the total population of all cities located in the continent of Asia. This requires data from two tables, 'country' and 'city', which are linked by a common field 'code' in 'country' and 'countrycode' in 'city'.
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The solution approach involves using a SQL query to join the 'country' and 'city' tables based on the common field. It then filters the results to include only those where the 'continent' field in the 'country' table is 'Asia'. Finally, it sums up the 'population' field from the 'city' table to get the total population.
select sum(city.population) from country left join city on country.code = city.countrycode where country.continent = 'Asia'
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