CodeRankGPT -
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The problem context involves a database with a table named CITY, which contains data about different cities. One of the fields in this table is POPULATION, which represents the population of each city. The task is to find the difference between the city with the highest population and the city with the lowest population.
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The solution approach uses SQL's built-in functions MAX and MIN to find the highest and lowest population respectively. The query selects the maximum population and subtracts the minimum population from it, thus giving the difference between the highest and lowest population in the CITY table.
SELECT MAX(POPULATION) - MIN(POPULATION)
FROM CITY
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