HackerRank
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HackerRank Python (Basic) Certification Solutions: All 10 Questions Explained
The HackerRank Python (Basic) test gives you 2 coding questions from a pool of 10. Here are all 10, with tested Python 3 code, a short explanation of each, and what to revise before you sit it.
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HackerRank SQL (Intermediate) Certification Solutions: Every Question Explained
The HackerRank SQL (Intermediate) test gives you 2 queries in 35 minutes, picked from a pool of 5 that share one invoices database. Here is each question with a tested MySQL query and a link to the full explanation.
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HackerRank SQL (Basic) Certification Solutions: All 5 Questions Explained
The HackerRank SQL (Basic) test gives you 2 questions from a pool of 5 in 30 minutes. Here are all five, each with a tested MySQL query and a link to the full explanation.