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SQL is an industry-standard query language that works with relational databases. Unlike some earlier systems, queries are performed at the server and only the results are passed to a client. This resulted in the ability to work with large databases efficiently over a network.
Explanation. The example describes following four projects: Project 1: Tasks 1, 2 and 3 are completed on consecutive days, so these are part of the project. Thus start date of project is 2015-10-01 and end date is 2015-10-04, so it took 3 days to complete the project.
Oct 19, 2021 · Tip #1: Gain some Basic SQL Knowledge First. Obviously, you need to have some fundamental SQL knowledge to start the challenges, though you’ll learn much more along the way. Learning basic SQL is relatively easy these days since we have tons of resources online to help you out. Two good sources I used:
Master Advanced SQL Selects for Interviews!This video tackles a SQL challenge from HackerRank, focusing on advanced SELECT statements. Conquer your next data...
Mar 1, 2016 · Julia conducted a days of learning SQL contest. The start date of the contest was March 01, 2016 and the end date was March 15, 2016. Write a query to print total number of unique hackers who made at least submission each day (starting on the first day of the contest), and find the hacker_id and name of the hacker who made maximum number of ...
Sep 21, 2023 · Welcome back to Part 2 of our SQL Interview Preparation series with HackerRank! In this installment, we’re elevating our game as we dive into intermediate-level SQL questions. These challenges are…
Welcome to the ultimate HackerRank SQL Solutions playlist by Data Analyst Explorers! 📊 Whether you're a budding data enthusiast or an experienced analyst, ...
