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6 kyu
Calculating Batting Average
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SQL Basics: Simple table totaling.
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SQL Basics: Top 10 customers by total payments amount
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SQL Basics: Simple EXISTS
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SQL Basics: Simple IN
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SQL with Harry Potter: Sorting Hat Comparators
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SQL Basics: Mod
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On the Canadian Border (SQL for Beginners #2)
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SQL Basics: Simple UNION ALL
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SQL Grasshopper: Select Columns
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SQL Basics: Simple HAVING
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SQL Basics: Simple GROUP BY
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Convert boolean values to strings 'Yes' or 'No'.
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Remove exclamation marks
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Ones and Zeros
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