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6 kyu
SQL Basics: Simple JOIN and RANK
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Present JSON data the SQL way
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Using LATERAL JOIN To Get Top N per Group
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Group-by and Sum
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SQL Basics: Top 10 customers by total payments amount
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SQL Bug Fixing: Fix the QUERY - Totaling
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Countries Capitals for Trivia Night (SQL for Beginners #6)
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SQL Basics: Group By Day
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Calculating Batting Average
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Make the Deadfish Swim
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Vowel Count
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Do you speak "English"?
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The Supermarket Queue
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