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Savvas Stephanides Profile picture
@SavvasStephnds
Aug 5, 2020 • 6 tweets • 4 min read • Read on X
There are a lot of types of databases out there. Which one you use depends on what you need it for. Here are a few examples 👇🧵

#100DaysOfCode #CodeNewbies #databases
▶️ RELATIONAL DATABASE

This is the most popular database out there. It depends on tables which have relationships between them (thus "relational"). Popular examples include:

👉@MySQL
👉 @PostgreSQL
👉 @SQLServer
▶️ NOSQL DATABASE

The opposite of a relational database. It doesn't rely on tables and relationships, which is why it's called No-SQL. It is instead (usually) reliant on documents. Popular examples include:

👉 @MongoDB
👉 @couchbase
👉 @dynamodb by @awscloud
▶️ GRAPH DATABASE

Databases that use "graphs" instead of tables for data. Graphs use nodes and edges to express relationships between entities. Examples:

👉 @neo4j
👉 @awscloud Neptune
▶️ KEY-VALUE STORE

Databases optimised for storing "dictionaries" or key-value pairs. Most popular example:

👉 @RedisLabs
▶️ TIME SERIES DATABASE

Databases optimised for storing "time series" data (data indexed in time order), used for (for example) trends. Example:

👉 @InfluxDB

• • •

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More from @SavvasStephnds

Savvas Stephanides Profile picture
Jan 23, 2023
What are Data Structures? 💿

Let's explain.
When you use a website or an app, a lot of things are going on in the background in order to give its users what they're looking for.

Things are being carried out and the result of these things depend on other things.
One of these things that influence how an app behaves, is the information that it has on hand. For example:

💿 The user's name so the app can give a personalised greeting.
💿 The list of tasks in a to-do list so the app can list them, add things or remove things from it.
Read 12 tweets
Savvas Stephanides Profile picture
Sep 27, 2021
Javascript is the most versatile programming language out there.

You can build anything: interactive web apps, to servers, to mobile and desktop apps.

It does come with its own set of concepts that anyone working with it should know.

Here's 11 of them, explained.

👇🧵
Promises, explained:

savvas.me/explained/prom…
async/await explained:

savvas.me/explained/asyn…
Read 12 tweets
Savvas Stephanides Profile picture
Sep 25, 2021
TOP 5 CHEST PRESS EXERCISES!

Thread 🧵👇 #FitnessWeekend Image
5. MACHINE CHEST PRESS

Equipment: machine

How to do it: bodybuilding.com/exercises/leve… Image
4. CABLE CROSS-OVER

Equipment: cable

How to do it: bodybuilding.com/exercises/cabl… Image
Read 8 tweets
Savvas Stephanides Profile picture
Jun 3, 2021
WHAT IS GRAPHQL?

Let's explain!
This thread is also available in a more readable and accessible format here:

🔗 savvas.me/explained/grap…
You probably heard of GraphQL as a new way to retrieve data from a web service. Possibly as an alternative to REST services. But what is it exactly?
Read 16 tweets
Savvas Stephanides Profile picture
Jun 1, 2021
How I made savvas.me

A thread 🧵👇 Image
1⃣ The stack:

I wanted my website to be as fast and snappy as possible.

Which is why this website is 100% Jamstack. The code, posts, assets are all stored in a repository on Github - github.com/savvasStephani….

...and the website itself is made with Gatsby. Image
2⃣ Hosting

For my website, I wanted for the builds to execute immediately after pushing new changes.

The Markdown blog files, the assets (images, videos), JS files, styling etc are all hosted on Github.

The end result from building the website is hosted and managed on Netlify. Image
Read 9 tweets
Savvas Stephanides Profile picture
Mar 29, 2021
Should I use forEach() or map()?

Both iterate through arrays in Javascript, but how do they differ? Let's see:

Thread 🧵👇

#100DaysOfCode #CodeNewbie #javascript
🚨 This thread is also available in a more accessible version here:

👇

🌐 savvas.netlify.app/explained/fore…
If you're learning Javascript, sooner or later you'll come across the forEach() and map() functions. It is quite often that there is some confusion about what each one does.
Read 15 tweets

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