HackerRank SQL Preparation: Revising the Select Query I(MySQL)

Problem Statement: Query all columns for American cities in the CITY table with populations larger than 100000. The CountryCode for America is USA.

Link:HackerRank - Revising the SELECT Query

Solution:

SELECT * FROM CITY WHERE POPULATION > 100000 AND COUNTRYCODE = 'USA';

Explanation: This SQL query retrieves all columns (*) for cities in the CITY table where the population is greater than 100000 and the CountryCode is 'USA'. Here's a breakdown of each part:

• SELECT *: Selects all columns from the CITY table.
• FROM CITY: Specifies the table from which to retrieve data, which is the CITY table in this case.
• WHERE POPULATION > 100000: Filters the rows to include only cities with a population larger than 100000.
• AND COUNTRYCODE = 'USA': Further narrows down the selection to cities located in America (USA) based on the CountryCode column.