Population Density Difference

Problem Statement

Given a City table, whose fields are described as

+-------------+----------+
| Field       | Type     |
+-------------+----------+
| ID          | int(11)  |
| Name        | char(35) |
| CountryCode | char(3)  |
| District    | char(20) |
| Population  | int(11)  |
+-------------+----------+

print the difference between the maximum and minimum city populations.

Solution

  
select max(Population)-min(Population) from City;

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