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7 kyu
SQL Basics: Raise to the Power
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SQL Basics: Group By Day
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SQL Basics: Simple EXISTS
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SQL Basics: Simple HAVING
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SQL Basics: Simple table totaling.
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SQL Bug Fixing: Fix the JOIN
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Rectangle into Squares
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Take a Ten Minutes Walk
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Bit Counting
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Highest and Lowest
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Moves in squared strings (I)
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Counting sheep...
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