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6 kyu
SQL Basics: Simple IN
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SQL Basics - Monsters using CASE
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SQL Basics: Simple JOIN and RANK
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SQL Basics: Simple EXISTS
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SQL Basics: Simple UNION ALL
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BASICS: Length based SELECT with LIKE
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SQL Basics: Simple HAVING
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SQL Basics: Top 10 customers by total payments amount
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Bouncing Balls
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Maximum Length Difference
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