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SQL Basics: Simple HAVING
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SQL Basics: Simple GROUP BY
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1. Find all active students
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SQL Basics: Simple MIN / MAX
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SQL Basics: Simple SUM
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How many are smaller than me?
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Battleship field validator
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So Many Permutations!
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Next bigger number with the same digits
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Range Extraction
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The observed PIN
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Sum Strings as Numbers
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Defuse the bombs!
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Snail
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