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7 kyu
Leap Years
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Easy SQL: Convert to Hexadecimal
9,558PG1
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Easy SQL: Counting and Grouping
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SQL Bug Fixing: Fix the JOIN
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SQL Basics: Simple IN
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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 NULL handling
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SQL Basics: Simple WITH
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6 kyu
SQL Basics: Simple UNION ALL
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SQL Basics: Simple HAVING
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7 kyu
SQL Basics: Simple JOIN
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SQL Basics: Simple JOIN with COUNT
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SQL Basics: Create a FUNCTION
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SQL Basics: Simple GROUP BY
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