Author: Martyna Sławińska

Martyna is a software developer with a passion for programming, automation, and innovation. Currently working for the global corporate IT consulting sector, she is a new-generation techie who hails from Warsaw University of Technology, Poland. She has certifications in both database administration and Java development. Her interests include creating small automation devices using embedded systems and various electronic components. In her free time, she practices yoga, which helps her to center her thoughts and come up with new ideas.

How to Define a Foreign Key in a Physical Model

A foreign key is one of the fundamental concepts of relational databases. You don’t store all your data in one table, but many different tables. Nonetheless, all your data is related. That’s where the foreign key comes into play. It facilitates the process of linking the tables. Read on to find out more. This article focuses on the concept of the foreign key in a physical model. First, we’ll briefly go over foreign key basics.

What Is a Primary Key?

Keys are one of the most vital features in a relational database. Among the many types of keys, the primary key is widely used and appreciated. Let’s find out what kinds of primary keys are available, what a primary key does, and how to use it in a table. In this article, you’ll learn all about primary keys in relational databases. The topics we’ll cover include: An overview of relational database keys.

Database Constraints in SQL Server and How to Model Them in Vertabelo

Database design – including where and how to use constraints – is essential to the correct function of your database. To properly implement database constraints in SQL Server, you must understand all the requirements and execute them accordingly. How would you do this? This article will explain it in detail! To design your database, you need a database blueprint, database constraints, indexes, database design software like Vertabelo – and more.

Constraints in MySQL and How to Model Them in Vertabelo

Before you do anything, you start with designing the database. It includes columns, tables, and relationships among them, as well as constraints. Database constraints play a crucial role in that they let you prevent any undesired data from being stored in a column or table. Let’s see how to make use of database constraints in MySQL. In this article, we’ll go through all database constraints available in a MySQL database:

Constraints in PostgreSQL and How to Model Them in Vertabelo

Database constraints allow you to give a certain shape to your data, tables, and columns. Are you planning to use PostgreSQL as your database? Check out what PostgreSQL constraints can do! In this article, we will go over PostgreSQL’s database constraints and see how to model them in Vertabelo. For each of the constraints, I’ll provide: A definition of the constraint. A usage example. Instructions on how to model the constraint in Vertabelo.

Database Constraints: What They Are and How to Define Them in Vertabelo

Database constraints help us keep our data clean and orderly. Let’s look at the most common database constraints and how to conveniently define them in Vertabelo. It’s a common practice to set rules for the data in a database. Thanks to these rules, you can avoid incorrect data in a column, e.g. a text string in an Age column or a NULL in a Name column. In this article, we’ll dive into SQL’s database constraints: PRIMARY KEY, FOREIGN KEY, NOT NULL, UNIQUE, DEFAULT, and CHECK.