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Employee Weekend Work: Counting Unique Weekends and Total Days Worked
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SQL Basics: Simple UNION ALL
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SQL Basics - Monsters using CASE
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SQL Basics: Raise to the Power
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SQL Basics: Simple EXISTS
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SQL Basics: Simple JOIN and RANK
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SQL: Concatenating Columns
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8 kyu
SQL Basics: Mod
16,396PG1
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SQL Basics: Simple JOIN with COUNT
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6 kyu
SQL Basics: Top 10 customers by total payments amount
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On the Canadian Border (SQL for Beginners #2)
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SQL Statistics: MIN, MEDIAN, MAX
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Calculating Running Total
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SQL Basics: Group By Day
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Relational division: Find all movies two actors cast in together
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