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 ...
PostgreSQL window functions make it possible to rank records, calculate running totals, and analyze data without combining ...
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.
Build an AI agent that audits whether a user's personal data was actually deleted. A deletion workflow may report Complete while data still exists in databases, logs, support attachments, exports, ...
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