So far, we’ve been mostly writing SQL queries that either store or retrieve the data from the database. Besides that, we can rely on PostgreSQL to process the data and get the computed results. By doing that, we can learn more about the rows in our tables. In this article, we look into how we […]
So far, we have returned the full content of our tables. However, as our database grows, this might prove not to be the best approach in terms of performance. A popular solution is to serve the data in chunks by presenting multiple pages or implementing infinite scrolling. In this article, we implement its back-end aspect […]
One of the challenges when working with databases is keeping the integrity of the data. In this article, we learn how to deal with it using transactions. A transaction can contain multiple different instructions. The crucial thing about a transaction is that it either runs entirely or doesn’t run at all. Let’s revisit the most common […]
Designing relationships between tables is one of the crucial parts of working with databases. In this article, we look into a more complex relationship called many-to-many. You can find the code from this article in this repository. The many-to-many relationship A many-to-many relationship happens when many records in one table relate to many records in another […]
Learning how to design and implement relationships between tables is a crucial skill for a backend developer. In this article, we continue working with raw SQL queries and learn about many-to-one relationships. You can find the code from this article in this repository. Understanding the many-to-one relationship When creating a many-to-one relationship, a row from […]
When designing a database, the tables we define often relate to each other. Managing those relationships is one of the essential parts of working with databases. The previous article taught us how to use raw SQL queries to set up our NestJS project to work with PostgreSQL. In this article, we go a step further […]
Object-Relational Mapping (ORM) libraries can often help us write our code faster. The ORM allows us not to write raw SQL. Instead, we can manipulate the data using an object-oriented paradigm. Using ORM can ease the learning curve of working with databases because we don’t need to go deep into learning SQL. Instead, we write […]
With feature flags (also referred to as feature toggles), we can modify our application’s behavior without changing the code. In this article, we explain the purpose of feature flags. We also show how to implement them ourselves and discuss the pros and cons. You can find the code from this article in this repository. The […]
So far in this series, we’ve defined many different modules that can group provides and controllers. None of them was customizable, though. In this article, we learn how to create dynamic modules that are customizable, making them easier to reuse. While doing that, we rewrite some of our old code to use dynamic modules. If […]
When working with relational databases, we define the structure of the data rather strictly. For example, we need to specify the format of every table along with fields, relations, indexes, and other structures. By doing that, we also tell the database how to validate the incoming data. It is crucial to think about the structure […]
