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 ...
16 HackerRank problems on joins, CASE, subqueries and CTEs, pivoting, and window functions. These are the hardest of the precourse lists: most need two or more steps. Finish the 1B and 1C lists first.
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