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Causation, Correlation and Crackpots

Joe Celko explores the dangers of muddling correlation and causation, emphasises the importance of determining how likely it is that a correlation has occurred by chance, and gets stuck into calculating correlation coefficients in SQL. Along the way, Joe illustrates the consequences of leaping to the wrong conclusion from correlations with tales of Pop Dread.

2009-10-19

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Detecting Deadlocks

By default, how often is the SQL Server Database Engine checking for deadlocks?

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