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5 kyu
SQL Basics: Group By Day
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SQL Basics: Simple WITH
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SQL Basics: Simple NULL handling
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SQL Basics: Simple UNION ALL
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SQL Basics: Simple PIVOTING data
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SQL Basics: Simple PIVOTING data WITHOUT CROSSTAB
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SQL Basics: Simple EXISTS
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SQL Basics: Up and Down
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Easy SQL: Counting and Grouping
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SQL with Street Fighter: Total Wins
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GROCERY STORE: Support Local Products
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SQL: Right and Left
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SQL Basics: Simple JOIN
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SQL Basics: Simple table totaling.
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Matrix Determinant
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