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4 kyu
Challenge: Two actors who cast together the most
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SELECT prime numbers
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SQL Basics: Simple NULL handling
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SQL Statistics: MIN, MEDIAN, MAX
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SQL Basics: Simple table totaling.
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SQL Basics - Monsters using CASE
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SQL Basics: Simple IN
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SQL Basics: Simple GROUP BY
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Best-Selling Books (SQL for Beginners #5)
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8 kyu
On the Canadian Border (SQL for Beginners #2)
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Relational division: Find all movies two actors cast in together
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SQL Basics: Simple JOIN and RANK
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SQL Bug Fixing: Fix the JOIN
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