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6 kyu
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Swap Case Using N
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SQL Basics: Simple NULL handling
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SQL Basics: Simple WITH
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SQL Basics - Monsters using CASE
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SQL Basics: Simple IN
12,220matt c
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SQL Basics: Simple EXISTS
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Driving School Series #2
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SQL Basics: Simple JOIN and RANK
12,580matt c
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SQL Basics: Simple table totaling.
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SQL Basics: Top 10 customers by total payments amount
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SQL Basics: Simple HAVING
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Mahjong winning hand Validation #2: DA SAN YUAN(大三元)
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Mahjong winning hand Validation #1: DA SI XI(大四喜)
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