Johan Åhlén

Johan Åhlén's blog about life, universe and everything.

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SQLug.se challenge 2010 - the Swedish national championship for SQL Server developers
The Swedish national championship for SQL Server developers, SQLug.se challenge 2010 , is now finished. The competition has been running on the Swedish SQL Server User Group's website, but I publish the competition problem also on my blog in case...
Try your SQL optimizing skills and win great honor
As winner of the previous round, I’ve been given the honor to write the problem for Phil Factor Speed Phreak Challenge #6. This problem is from the real world (algorithmic trading) and the sample data is real. The challenge is to reproduce highest buy...