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.

Put your thinking cap on, because it's time to find out how much you know about history, geography, math, science, food, animals, entertainment and pop culture with this roundup of easy trivia ...

SQL (Structured Query Language) — язык запросов для работы с реляционными базами данных, который появился больше 50 лет назад и остаётся одним из самых ...

Practice 15 SQL interview questions tailored to e-commerce and marketplace data science roles. Covers customer analytics, product ranking, funnel queries, seller metrics, and time-based business ...

Master every SQL window function pattern tested in data science interviews. 14 worked problems covering ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD, running totals, NTILE, and complex multi-window queries ...

user_id = 99 не существует в users, а пользователи Anna (4) и Kemal (5) не делали заказов. Это важно для понимания JOIN-ов. Потому что тестировать через UI — это ...

Since release 1.7, Data API builder (DAB) has had MCP support to securely provide agents access to your production data. To support small and massive databases, DAB consolidates operations into five, ...

If you've ever wanted to get to know someone a bit better but didn't know how to go about it, please allow us to introduce you to the 21 questions game. The word "game" is used very loosely here, ...

Curious engineer writing about things that work, fail, and unexpectedly scale. SQL practice is boring because nothing feels real. You type SELECT * FROM users, get a green checkmark, move on. The data ...

So, you’re wondering if HackerRank is free to use, right? It’s a common question, especially when you’re looking to practice coding skills or maybe even hire some new talent. Many platforms offer a ...