HackerRank: [SQL Aggregation] (3/17) REVISING AGGREGATIONS - AVERAGES | avg 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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Recommended SQL Courses:

1. Udemy: SQL - MySQL for Data Analytics and Business Intelligence
2. LinkedIn: Master SQL for Data Science
3. edX: Databases: Advanced Topics in SQL
4. edureka: SQL Essentials Training & Certification
5. Coursera: Learn SQL Basics for Data Science
6. Eduonix: SQL Queries

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SQL Problem Statement:

Query the average population of all cities in CITY where District is California.

Input Format:

The CITY table is described as follows:

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Solution: Using AVG Function (MySQL Query):

SELECT AVG(POPULATION)
FROM CITY
WHERE DISTRICT = 'California';

NOTE: 

1. AVG is an aggregation function used to calculate the average of the values of all the records in the specified column name passed to the function.

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Sample Output:

113000.6667

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-Akshay P Daga