Pete's Soapbox

Whatever's on Pete's mind today. I suppose we can expect Christianity, IT, programming, math, rights and, well, we'll find out.

15 October 2021

DevExpress XML Serialization Format

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I've been stuck picking through serialized DevExpress layouts by hand lately. One aspect of it that had me confused for a while was this...
15 December 2020

How to define a variable within a Microsoft SQL query

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Sometimes a SQL query ends up needing an expression to be represented more than once. For example, some queries I've worked on have requ...
27 June 2020

Moving Average in Excel Power Query

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Here's a general-purpose Power Query 'rolling' function that can be used to make a rolling averages / moving average, or any oth...
26 March 2020

Determining the growth rate of a published chart

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A friend drew my attention to this page comparing the Bay Area COVID-19 cases to New York . But it can be hard to judge visually how steep a...

Exponential growth - Year 10 maths revision

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"When will I ever need to use logarithms, or raising something to the the power of 1/n in real life". During Covid-19, it turns ou...
6 April 2018

Using NULLIF to avoiding duplicating long T-SQL sub expressions for safe division, exclusive between

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I seem to find myself generating a lot of SQL from other higher-level query structures. And it's bugged me for a while that if I have so...
13 November 2017

Jaycar Arduino 16 Key Touch keypad XC4602

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So my ten year old daughter wanted to build a keypad enabled electric lock for her bedroom "to keep her little brothers out".  TLD...
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Peter Aylett
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