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SQL Basics - Monsters using CASE
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SQL Basics: Create a FUNCTION (DATES)
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SQL Basics: Simple NULL handling
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SQL Basics: Simple WITH
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SQL Bug Fixing: Fix the JOIN
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SQL with LOTR: Elven Wildcards
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Easy SQL: Counting and Grouping
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SQL Basics: Simple JOIN and RANK
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SQL Basics: Simple JOIN with COUNT
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