For those new to data analysis, I have compiled a list of free sites where you can practice SQL, methods for setting up your own practice environment, and 10 practice problems to review the content of ...
PostgreSQL window functions make it possible to rank records, calculate running totals, and analyze data without combining ...
As of November 2026, the most popular database management system (DBMS) worldwide was Oracle, with a ranking score of *****; MySQL and Microsoft SQL Server rounded out the top three. Although the ...
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 ...
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SQL tricks with billionaires data
Intermediate SQL tutorial demonstrating REGEXP for advanced filtering, IF & CASE statements to create categories, SUBQUERIES for complex analysis, and JOINS for combining multiple tables — all shown ...
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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