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4 kyu
Range Extraction
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9,168PG1
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SQL Basics - Position
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SQL: Concatenating Columns
13,438PG1
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SQL Basics: Create a FUNCTION
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Easy SQL: Counting and Grouping
15,207PG1
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Best-Selling Books (SQL for Beginners #5)
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SQL Basics: Simple JOIN with COUNT
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SQL Basics: Simple GROUP BY
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Easy SQL: Convert to Hexadecimal
9,621PG1
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