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  1. Certification Tests

SQL (Basic) Certificate

Nick Cohen's HackerRank Certificates

Certificate: SQL (Basic)

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Certificate: Python (Basic)

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Certificate: Ruby (Basic)

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Certificate: Python (Intermediate)

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Certificate: Problem Solving (Intermediate)

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Certificate: Problem Solving (Basic)

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Certificate: Java (Intermediate)

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Certificate: Problem Solving (Advanced)

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Certificate: Ruby (Intermediate)

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Certificate: C++ (Basic)

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Certificate: C (Basic)

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Certificate: C (Advanced)

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SQL (Basic)

It includes simple queries, relationships, and aggregators.

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