2025-04-22
We’re so close to finalize the Introduction to SQL articles, but before that we have another critical topic to learn: Entity Relationships So far, we learned that Entity is synonyms of Tables. In database administration, only those things about w...
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2025-04-15
Now that we know how to set and work with multiple tables, it is time to join all of these tables in some manner, just to have more sense about the data stored right there, or because we want to search for a particular data. To do so, we have to ...
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2025-04-08
Now we have a basic knowledge about databases and SQL. It's time to move into another important topic: Multiple Tables and Joins. As we learned previously, relational databases can “connect”, “relate”, “associate” or “join” two or more tables betw...
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2025-04-01
We’ve been advancing a lot in SQL over the last blog posts. Now we’ll be studying to important concepts in relational databases like Aggregate Functions and Grouping Note: to follow this tutorial we’ll continue with databases created in Introduct...
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2025-03-25
So far so good, we have been learning the basics of databases and SQL. Now we want to enter one of the most important topics in SQL: the queries. A query is really a question or request for data. For example, ''Tell me how many products there are ...
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2025-03-18
Now that we have a gentle introduction to databases and SQL, it’s time to start with Constraints and Queries. Constraints SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can...
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2025-03-11
Now that we know, from a high level point of view, about how databases works it’s time to start experimenting with the Database Management System (DBMS) choosed, in our case: PostgreSQL. However, so many times people tend to go over it without giv...
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2025-03-04
So far we’ve been studying the details of Ruby and Oriented-object programming. All of this with the idea of starting working with Rails. We are one step closer to that. But before we start studying Rails we have to understand a little bit about D...
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2025-02-25
Now that we know the basics about Ruby, Object-oriented programming, Text Editors, Git, Github, Consoles, AWS instances and much more, it’s time to explain how to connect all of these concepts. Probably this is one of the worst explained things in...
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2025-02-18
To start this post, let’s imagine we started having a lot of different classes in our program. Is quite possible that we end up with equal class names. For instance, you decide to name a class as “Figure”. Months later, you’ll start to forget the ...
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2025-02-11
Let’s continue our advance in Ruby OOP, this time we’ll be talking about inheritance. Ruby inheritance is a way to reuse code in Oriented-object programming (OOP). Using inheritance, a Class can use the methods from other Class or Classes. The e...
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2025-02-04
Now we have enough knowledge to continue our talkings about Ruby classes and objects. We have been studying OOP in detail and doing challenges. Let’s talk about other topics related with OOP in Ruby Everything is an object in Ruby As we already k...
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2025-01-28
So far we have enough theoretical knowledge to understand Classes and Objects in Ruby. If you have been following previous blog post, here we have the order to study this subject - Introduction to Object-Oriented Programming in Ruby- Methods and ...
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2025-01-21
At the end of the last blog post called: Methods and Attributes in Object-oriented programming in Ruby we study about attributes. Let’s recap Attributes (object information) Just as an object has behavior (methods), objects can also have informa...
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2025-01-14
In the last blog post we introduced the concept of Object-oriented programming in Ruby, we talked about the different programming paradigms and we created our first Class and Objects. Just to recap a bit about the code we wrote in that blog post, ...
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2025-01-07
After all the content we’ve created so far, it’s time to introduce you to a concept which, at the same time, is the main paradigm of Ruby and other modern programming languages: object-oriented programming. But as always, we have to have a good c...
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2024-12-31
Sometimes we'll need to deal with file management with Ruby. For instance, you receive a .txt file from your Project Manager (PM) and you have to read what’s inside. Other times you have to write something there. Cases like this can happen with di...
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2024-12-24
Now you have an idea about how to solve the coding challenges (or at least) how they are structured, read and solved. Probably you noticed that it is easy to follow through the steps if you stick to the framework to solve coding challenges. So let...
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2024-12-17
Now we have a lot of knowledge to put into practice. Even in the last blog post we talked about how to solve coding challenges. That post followed by the large amount of previous ones, you have the basis to solve current and next coding challenges...
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2024-12-10
Now we have a lot of knowledge to put into practice, so far we’ve seen these articles:about Ruby and Data Structures. Articles about Ruby - What's Ruby (Programming Language)?- Ruby Data Types: Strings, Numbers and Booleans- Variables and User I...
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