Tag: sql

CodeWars: Learn programming through test-driven development

CodeWars: Learn programming through test-driven development

As I wrote about Project Euler and CodingGame before, someone recommended me CodeWars. CodeWars offers free online learning exercises to develop your programming skills through fun daily challenges.

In line with Project Euler, you are tasked with solving increasingly complex programming challenges. At CodeWars, these little problems you need to solve with code are called kata.

Kata take a test-driven development approach: the programs you write need to pass the tests of the developer who made the kata in the first place. Only then are you awarded with honour and can you earn your ranks and progress to the more complex kata.

Sounds fun right? I’m definitely going to check this out, as they support a wide range of programming languages, each with many kata to solve!

Python, Ruby, C++, Java, JavaScript and many other main programming languages are already supported, but CodeWards is also still developing kata for more niche or upcoming languages like R, Lua, Kotlin, and Scala.

Free course: SQL for Data Science

Free course: SQL for Data Science

Kirsten Kehrer from datamovesme.com does all kinds of super valuable stuff in SQL and end of 2019 she decided to share it with the world via a free SQL course.

Screenshot from youtube.com/watch?v=W5AiLYR02l8

The course is focused on data science and has 5 modules with video lectures:

Kirsten advises to take the course with dual monitors, as she also provides an online SQL query builder environment, where you can write your queries during the videos.


Moreover, Kirsten also published the slides and the code to go with the course, so you can really learn along:

A nice touch is that Kirsten simulated some data for a fictitious e-commerce company, that really allows you to get a feel for the type of data you’d be working with in practice:

Screenshot from youtube.com/watch?v=itpvD0Eb_s4

GoalKicker: Free Programming Books

This specific link has been on my to-do list for so-long now that I’ve decided to just share it without any further ado.

The people behind GoalKicker, for whatever reason, decided to compile nearly 100 books on different programming languages based on among others StackOverflow entries. Their open access library contains books on languages from Latex to Linux, from Java to JavaScript, from SQL to MySQL, and from C, to C++, C#, and objective-C.

Basically, they host it all. Have a look yourself: https://books.goalkicker.com/

SQL resources (free courses, books, & cheat sheets)

SQL resources (free courses, books, & cheat sheets)

My list of SQL resources is still quite short so if you have additions, please comment below or contact me! There are separate overviews for Data Science, Machine Learning, & Statistics resources and for R resources and Python resources.

LAST UPDATED: 11-11-2018

Cheat sheets: