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Directions Reduction
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SQL Basics: Create a FUNCTION (DATES)
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SQL Basics: Simple table totaling.
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SQL Basics: Simple JOIN and RANK
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SQL Basics: Top 10 customers by total payments amount
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SQL Basics: Simple IN
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SQL Basics: Simple EXISTS
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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 HAVING
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