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6 kyu
SQL Basics: Simple HAVING
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SQL Basics: Simple GROUP BY
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1. Find all active students
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SQL Basics: Simple SUM
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SQL Basics: Simple WHERE and ORDER BY
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6 kyu
Equal Sides Of An Array
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Objectify a URL Query String
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Count Odd Numbers below n
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6 kyu
The Supermarket Queue
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4 kyu
Next bigger number with the same digits
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4 kyu
Next smaller number with the same digits
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8 kyu
L1: Set Alarm
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IQ Test
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Rot13
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Roman Numerals Decoder
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