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T-SQL: The Rozenshtein Method

The Rozenshtein Method is a method used in T-SQL for crosstab queries and pivoting. Stephen Forte explains:


"This method uses Boolean aggregates, so that each column has a numeric expression that resolves each row as a zero or one and that value (0 or 1) is multiplied by your numeric expression (Like TotalSales or (UnitPrice*Quantity)."


The query uses the following logical expression:


ABS(SIGN(expression))

SIGN evaluates the expression to 1 or 0 or -1, ABS reduces it to 0 or 1, so we get aka boolean aggregate. Impressive. It reminds me using ISNULL for conditional search queries.


[ via Mladen ]


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Sunday, July 09, 2006 1:38 AM

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# Interesting Finds: July 9, 2006

7/9/2006 7:26 PM by Jason Haley

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