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;