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 ...

Description : Warm welcome to everyone!! I decided to add all my solutions for SQL problems in Hackerrank platform. Feel free to arise PR.Thanks in advance :) There ...

Student Advisor is one of the five questions in the HackerRank SQL (Basic) certification test. It looks like a copy of the other join questions, but it has two salary limits, one for each gender, and ...

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Profitable Stocks is one of the five questions in the HackerRank SQL (Basic) certification test. It is short. The two things to get right are the comparison and the sort. There is one table of today’s ...