Phil Jacobs

Phil began his career as a Member of the Technical Staff at Bell Labs. For the last 24 years he has worked at Moody's Investors Service where he is currently Vice President - Senior Database Developer in the Analytic & Technology Solutions Group supporting Structured Finance. Phil holds a Sc.B. in Computer Science from Brown University and a M.S. in Computer Science from Purdue University.

Optimize Your SQL by Reformulating the Spec

As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.

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2019-09-12

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