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) |
+-------------+----------+
you have to print the sum of population of all the cities of Japan. The CountryCode for Japan is “JPN”.
Solution
select sum(Population) from City where CountryCode= 'JPN';