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6 kyu
SQL Basics: Simple NULL handling
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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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Sum of odd numbers
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SQL with Harry Potter: Sorting Hat Comparators
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SQL: Concatenating Columns
13,500PG1
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Register for the Party (SQL for Beginners #3)
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6 kyu
Unique In Order
186,032pinelopi
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SQL with LOTR: Elven Wildcards
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GROCERY STORE: Support Local Products
8,453baaart
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GROCERY STORE: Inventory
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7 kyu
SQL Basics: Up and Down
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SQL Basics - Position
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Disemvowel Trolls
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