October 2020 - Terr For MER

The Event Loop is one of the most important aspects in JavaScript, knowledge of which allows you to write more efficient code. In this article, we will look at how the main thread works in JavaScript and how it handles asynchronous functions. For a long time, I’ve been writing JavaScript code without fully understanding how …

SQLite is not a toy

Here’s why SQLite is perfect for your day-to-day work. It doesn’t matter if you are a developer, analyst, tester, admin or product manager.

For starters, a few known facts:

SQLite is the most widely used database management system in the world, included in all popular operating systems.

Works without a server.

For developers, it is embedded directly into the application.

For everyone else – a convenient console (REPL) in one file (sqlite3.exe on Windows, sqlite3 on Linux / macOS).

Console, import and export

The console is a killer feature of SQLite: a more powerful data analysis tool than Excel, and much simpler than any pandas. Data from CSV is loaded with one command, the table is created automatically:

> .import –csv city.csv city
> select count (*) from city;
1117

Basic SQL features are supported, and the console shows the result in a nice table. There are also advanced SQL features, but more about them later.

select
century || ‘th century’ as dates,
count (*) as city_count
from history
group by century
order by century desc;