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 than100000. -
AND COUNTRYCODE = 'USA': Further narrows down the selection to cities located in America (USA) based on the CountryCode column.
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