Introduction to ARM Semihosting

Divisibility by any prime

How Materialize and other databases optimize SQL subqueries

Issue #65

2/17/2021

A Byte of Coding Issue #65
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Introduction to ARM Semihosting

Published: 16 February 2021
Tags: c, microcontrollers


It's been a while since I've gotten down and dirty with microcontrollers, but I remember many a long hour debugging errors with terrible logs and information, because it wasn't trivial to determine what the microcontroller was actually doing. Fortunately it looks like with ARM microcontrollers, you can run some additional C code with the help of a built in feature. Amine El Messaoudi's article introduces this feature, and demonstrates how you can get it running.

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Divisibility by any prime

Published: 17 February 2021
Tags: math


The connections between different parts of math always blow my mind. It kind of makes me feel like I'm tripping. In this article, John D. Cook doesn't disappoint, illuminating a simple algorithm of determining if a number is divisible by a prime using linear algebra.

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How Materialize and other databases optimize SQL subqueries

Published: 17 February 2021
Tags: sql


Subqueries are a pretty intuitive way of connecting data from different tables in SQL. Personally I use them quite a lot, but I never realized the implications. Jamie Brandon's article underlines the potential inefficiencies of subqueries, and educates on the approaches used by different databases to better optimize queries. Pretty rad stuff.

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Link Clicks Clicks % Unique Clicks Unique Clicks %
Divisibility by any prime 153 43.10% 133 45.70
How Materialize and other databases optimize SQL subqueries 113 31.83% 90 30.93
Introduction to ARM Semihosting 78 21.97% 60 20.62
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