Hiring a backend developer is an essential part of building a successful software product. The backend forms the backbone of ...

HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses, where developers compete by trying to program according to provided specifications.

HackerRank: A popular platform for coding challenges, HackerRank offers a vast collection of SQL problems, ranging from beginner to advanced. You can practice SQL queries, joins, aggregations, and ...