HackerRank: [SQL Aggregation] (5/17) JAPAN POPULATION | sum function in SQL

HackerRank: [SQL Aggregation - 5/17] Japan Population | SUM Function in SQL
I started studying SQL from a very famous site - HackerRank. Here I will try to provide multiple approaches & solutions to the same problem. It will help you learn and understand SQL in a better way.

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SQL Problem Statement:

Query the sum of the populations for all Japanese cities in CITY. The COUNTRYCODE for Japan is JPN.



Input Format:

The CITY table is described as follows:

CITY Columns




Solution: Using SUM Function (MySQL Query):

SELECT SUM(POPULATION)
FROM CITY
WHERE COUNTRYCODE = 'JPN';

NOTE: 
  1. SUM is an aggregation function used to calculate the sum or total of the values of all the records in the specified column name passed to the function.




Sample Output:

879196

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